Linux phones are getting closer and closer to usability every day. I don't care that they'll always be less polished than iOS or Android, I want a Linux phone.
Your best bet right now IMO would be flashing PostmarketOS onto a used OnePlus 6, which is cheap, has good specs and none of the battery issues plaguing the Pinephone Pro. That said, it's not 100% ready to be a phone yet- for now its best use case is as a mini-tablet / PDA kind of thing. Really feels like carrying a pocket laptop around, which is pretty fun as a starting point.
Pinephone has a great active community, and the device itself is dirt cheap (also pretty low-specced). There's a pro version with a much better specs in theory, but development state is much rougher. Not that the basic model is anywhere near daily driver material yet, but the progress is very appreciable every time i check in.