I'm currently using GrapheneOS on my Pixel phone I brought secondhand so think I should (for now) be okay?

Otherwise, Linux phone looks interesting but it just relearning both another OS (like iPhone users trying to learn Android and vice versa) and also just I have low income so buying new tech is just expensive.

I don't want to throw myself a deepend to an OS that I not as familiar with beside on my desktop and Raspberry Pi. Personally, I prefer to know what's there before I just go blind so at least I can manage my expectation than expected it to do 1:1 stuff that I do on my phone right now.