You could switch to Wayland to check if it behaves the same, worse or better. to switch, go to the Login Screen. Click there on Your Profile so that the Password Field appears. When it is appeared, You should see in the bottom right Corner a Gear Icon click on it. Choose there the Option ''Zorin Desktop'' and then log in.
You have added cappelikan and the Liquorix PPA which wasn't neccessary. From the Link that @Nourpon has posted, You only had to follow the 2 Steps on:
For the Error with this lunarg vulkan Repo Error:
Open the Terminal and type ls /etc/apt/sources.list.d and post the Output here.
That could help. Also it would be worth to think about combining it with a more current Mesa Driver (Graphics Driver).
But first, we should bring a bit Order in and take care about the other Stuff one by one.