Are you in your late 30s? Is it possible you’re maybe hitting perimenopause? If your estrogen levels drop, you may need to reduce your meds. I found that out the hard way. My levels had been stable for years, then all of a sudden it seems I was overmedicated, but when I looked back over the last year, I could see where I had been having some issues, but I just though it was all the pandemic stuff. But then I started losing weight and losing hair, and found out I was overmedicated at my annual Endo appointment. A few months later my GP tested FSH and LH, which were very high, so menopausal, which would explain some of what happened.

If a person goes on HRT/MHT and raises their estrogen levels, they may have to up their thyroid meds again.

I would get a second opinion. Some people with "subclinical hypothyroidism" feel totally fine and others feel terrible. The dividing line between subclinical hypothyroidism and hypothyroidism is fairly contentious - even within the medical community. Traditionally, a TSH between 5 & 10 was considered subclinical hypothyroidism and you wouldn't be treated unless you were trying to get pregnant regardless of symptoms. In some places (like the UK), this is still the standard. In the US, it really depends on your medical provider. For example, my endo will treat anyone automatically if their TSH is above 7 and she'll treat people with a TSH between 5 & 7 on a case by case basis (mostly depends on symptoms, comorbidities, and family history).

My TSH was barely out of range (just above 4.5) when my cholesterol skyrocketed. It took another year for my TSH to go above 10. My GP didn't have any really good advice for dealing with cholesterol because all of her diet suggestions were things I wasn't eating. I have celiac so I'm not eating fast food (deep fried breaded things, etc) or a bunch of other things on her list because I'm gluten free. My GP even acknowledged that the standard suggestions didn't make sense. I basically didn't eat eggs for a year as that was the main food on the list that was in my diet. It had zero impact.

Over the course of a year, I also developed fatigue as my other main symptom and assumed I had gluten cross contamination I hadn't identified since fatigue is one of my celiac symptoms. I was super surprised by the hypothyroidism (caused by Hashimoto's). It took about 8 months of thyroid treatment for my cholesterol to come down - my cholesterol is still a touch too high but my doctor thinks upping my veg/fruit (via like a daily smoothie) will be enough. Diet changes alone had no impact and since my cholesterol has come down so much, my doctor is no longer considering statins.