I started a similar thread here. But I’m talking to myself…
Voice typing needs google services. I haven’t found any alternative.
I don’t think glide typing is available in openboard. You need to take a look at florisboard (beta) or anysoftkeyboard.
To be honest I haven’t found a really good FOSS keyboard. Especially regarding word suggestion.
I use anysoftkeyboard at the moment. The least worst I could find.