I use FreshRSS as well and I use it exclusively from Android (Firefox Browser). Works surprisingly well even if it looks a bit dated.

I'd love recommendations for a good Android client. Right now I just have the site installed as a web app. It works, but I have a foldable phone and the site displays a little weird when unfolded in landscape.

FocusReader works well, the free version has some ads.

gReader Pro is pretty good on Android, doesn't get in the way too much.

I’m run an instance as well. I use Lire as client for iOS.

Lire is hands down the best reader on iOS, and a one-time purchase too. I really love it.