Look, you can't just ignore what other people are charging or you'll price yourself into a corner. Most premium bundles sit around $29-49, so if you go $99 you look crazy expensive. Go too low like $15? People think your stuff sucks. I'd stay within 20-30% of similar products unless you've got something special - better designs, licensing, whatever. Honestly the whole thing's kind of annoying because you're constantly checking what everyone else is doing. Check competitor prices every few months and tweak your tiers, but don't go nuts with it.

Bundle your templates by theme instead of selling them one by one - works way better for seasonal stuff. I'd do 20-30% off for limited time, maybe add some exclusive designs people can't get normally. Back to school bundles are huge right now, honestly. Try tiered pricing too. Basic pack, premium, then the "everything" option. Don't just slap "holiday sale" on your regular prices though - make the seasonal angle actually worth something. Oh and test different discount amounts, see what your people respond to best.