I used to wear a lot of polos too. Anything with a collar. Once I started T and really started changing physically (and also got top surgery), wearing polos became strangely dysphoric for me. I have to dress business casual for work so I still wore button downs daily, but for some reason I just didn't like how the polos fit for me.
I also found that the shirts I had no longer fit very well. They were too small in the shoulders and too loose on the bottom.
When I was about 2.5 years on T (a couple months ago), I was hot, and had a much more active day at work than normal and I decided to go try on some polos at the store. I found that I loved them! I found styles that fit my new physique well and I look extremely masculine in them.
So perhaps it's a combination of finding new ones (I find that anything I wore before sometimes makes me dysphoric because I see the "old" me in them) and finding some that fit better. If that doesn't work, maybe give yourself a mental break from them and come back in a few months to see if you like them again.
Of course, people's styles change and their tastes change over time so it may just be that you don't dig polos anymore. That's ok too
