You might occasionally hear that said in a joking way, with roughly the meaning you intend, but it's not proper English, no. You'd ask to have something specific fixed, like writing, as in your example.

Seriously talking about "fixing someone" is usually offensive, as it implies that something is so deeply wrong with them that they're "broken" or less than human.

Answer from the-baby-is-you on Stack Exchange
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Cambridge Dictionary
dictionary.cambridge.org › dictionary › english › fix
FIX | English meaning - Cambridge Dictionary
FIX definition: 1. to repair something: 2. to arrange or agree a time, place, price, etc.: 3. to fasten something…. Learn more.
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Merriam-Webster
merriam-webster.com › dictionary › fix (someone) with
FIX (SOMEONE) WITH Definition & Meaning - Merriam-Webster
—used with words such as stare, look, gaze, etc., to say that a person is looking directly at someone in a certain way · She fixed him with an angry stare.
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TheFreeDictionary.com
idioms.thefreedictionary.com › fix+(someone)
Fix (someone) - Idioms by The Free Dictionary
A: "What I need is a fix!" B: "What you need is to go to rehab and get clean!" Sorry, man, I'd give you a fix, but I don't have any drugs on me right now. To exact revenge upon or punish someone.
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Collins Dictionary
collinsdictionary.com › dictionary › english › fix
FIX definition and meaning | Collins English Dictionary
Paints consist of pigments bound by a medium which fixes the colour. [VERB noun] ... If you say that you will fix someone, you mean that you will stop their activities permanently.
Published   March 12, 2018
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Longman
ldoceonline.com › dictionary › fix-up
fix somebody/something ↔ up | meaning of fix somebody/something ↔ up in Longman Dictionary of Contemporary English | LDOCE
From Longman Dictionary of Contemporary Englishfix somebody/something ↔ up phrasal verb1 ARRANGE A MEETING, EVENT ETCto arrange a meeting, event etc I fixed up an interview with him. We’ll have to fix up a time to meet.2 IMPROVEto decorate or repair a room or building SYN do up We fixed ...
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Cambridge Dictionary
dictionary.cambridge.org › dictionary › english › fix-with
FIX SOMEONE WITH SOMETHING - Cambridge English Dictionary
FIX SOMEONE WITH SOMETHING definition: 1. to look at someone in a particular way, especially for longer than usual: 2. to look at someone…. Learn more.
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Collins Dictionary
collinsdictionary.com › dictionary › english › get-a-fix-on-someone-or-something
GET A FIX ON SOMEONE OR SOMETHING definition and meaning | Collins English Dictionary
GET A FIX ON SOMEONE OR SOMETHING definition: to have a clear idea or understanding of someone or something | Meaning, pronunciation, translations and examples
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Thought Catalog
thoughtcatalog.com › love
This Is What Fixing Someone Really Means Because It’s More Than Just Trying To Change Them | Thought Catalog
September 4, 2017 - Fixing someone means unbreaking their heart piece by piece, when you give them a new kind of love they’re not used to, when you send them good morning and good night texts when they were used to having their texts ignored.
Find elsewhere
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Reverso
dictionary.reverso.net › english-definition › fix+someone
FIX TO - Definition & Meaning - Reverso English Dictionary
fix someone definition: prepare to do something. Check meanings, examples, usage tips, pronunciation, domains, related words.
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WordReference
forum.wordreference.com › english only › english only
Fix someone up | WordReference Forums
February 21, 2020 - What do you need explaining? To fix someone up with something means to supply/provide them with something.
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Oxford Learner's Dictionaries
oxfordlearnersdictionaries.com › definition › american_english › fix_1
fix verb - Definition, pictures, pronunciation and usage notes | Oxford Advanced American Dictionary at OxfordLearnersDictionaries.com
7[often passive] fix something ... young, by means of an operation see neuter punish · 9fix somebody (informal) to punish someone who has harmed you and stop them from doing you any more harm Don't worry—I'll fix him....
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Encyclopedia Britannica
britannica.com › dictionary › fix
Fix Definition & Meaning | Britannica Dictionary
FIX meaning: 1 : to make (something) whole or able to work properly again to repair (something); 2 : to deal with or correct (a problem)
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Longman
ldoceonline.com › dictionary › get-a-fix-on-somebody-something
get a fix on somebody/something | meaning of get a fix on somebody/something in Longman Dictionary of Contemporary English | LDOCE
From Longman Dictionary of Contemporary Englishget a fix on somebody/somethingget a fix on somebody/somethinga) TMto find out exactly where someone or something is He peered out, trying to get a fix on the enemy’s position. b) UNDERSTANDto understand what someone or something is really like ...
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Longman
ldoceonline.com › dictionary › fix-on
fix on somebody/something | meaning of fix on somebody/something in Longman Dictionary of Contemporary English | LDOCE
From Longman Dictionary of Contemporary Englishfix on somebody/something phrasal verbCHOOSEto choose a suitable thing or person, especially after thinking about it carefully We’ve finally fixed on a place to have the concert.
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Quora
quora.com › Whats-the-difference-between-trying-to-fix-a-person-and-trying-to-help
What's the difference between trying to fix a person and trying to help? - Quora
Answer (1 of 8): Ooh that's an wasy one: Trying to help someone is giving them the tools they need to achieve a goal or to walk them through the first steps of something(such as building their resume up with them if they need to apply for a job). Another exemple would be to invite them on a hicki...
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Quora
quora.com › What-does-fix-a-boyfriend-mean
What does 'fix a boyfriend' mean? - Quora
Answer (1 of 2): Ahh—so you have heard about how some women might want to ‘’fix ‘’ a boyfriend…! Sometimes people think that, by becoming attached to someone emotionally, they will be capable of CHANGING (‘’fixing’’) the other person’s behavior…
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Merriam-Webster
merriam-webster.com › dictionary › fix
FIX Definition & Meaning - Merriam-Webster
to make something whole or able to work properly again : repair, mend; to deal with, solve, or correct (a problem); restore, cure… See the full definition
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Zoosk
zoosk.com › date mix › relationship advice › what does it really mean to fix someone in a relationship?
What Does It Really Mean to Fix Someone in a Relationship?
May 31, 2021 - When you cling to another person out of fear of abandonment and deep-seated feelings of emptiness, you attract the sort of person who takes rather than gives. You need to teach yourself that you can stop settling for less, and stop expecting another person to change and become your fantasy lover. Declare right now that you deserve the very best, not a fixer-upper relationship.