The default keyboard sucks. You can just get GBoard again and disable network permissions if you wanna preserve some privacy.
Discussion
Florisboard is great and opensource
I like Futo and Heliboard, Floris is also good. For the average person coming over from stock Android, GBoard remains the best feeling keyboard tho. The open source keyboards just can't quite match the haptic feel and autocorrect abilities in my experience. They're all fine tho if you're willing to take a bit of a UX hit for improved privacy.
Even without any permissions, GBoard has additional services on which link to Google Play services. You can check this by going to developer options under system setting and clicking on running services.
