HeliBoard is amazing, I recommend it! For those wondering how to enable simultaneous multi-lingual support (i.e. swipe or text in both languages and get predictions in both languages), I explained it in this comment chain, and included a screenshot for reference:
https://lemm.ee/comment/9410038
I tried both, AnySoftKeyboard was a bit too much effort and took me longer to type on unfortunately. HeliBoard was a nice replacement for SwiftKey for me though.
Same here actually, ~10 years too lol, since my first Android. SwiftKey worked very well (for me at least) but its owned by Microsoft, which gathers user data. I’ve been making a switch to FOSS apps and trying to degoogle myself in the recent months.
It was hard for me to leave SwiftKey due to other options being unsatisfactory / other keyboards always missing something, but HeliBoard did the trick for me :)