APP not working in Android 11 only works in Android 10, Suggestions?

My daily use APP it's not working in Android 11 only works on my stocking Android 10, the APP hasn't been update for 9 month so I doubt any new update will come out soon.

My Samsung phone only allow me to postpone update to Android 11 twice

Any Suggestions? Can I try some android emulator in my Samsung phone?

Thanks!