IMHO, you should stay on the 20.04 LTS.
I tried 20.10 “groovy” but there are less kernels available compared to the 20.04 LTS, and you can’t install Intel’s media runtime packages.
I don’t know if your issues are related to mine (you have 10th gen CPU, I have 11th gen), but you can try to install the OEM “edge” kernel (5.10 based) and Intel’s runtime packages
