For the first one, you should probably be using Wayland. X11 is considered an obsolete legacy window system, it's simply not going to stay relevant for modern uses.

For the second one, I don't have any tips for you, nobody can fix that but nvidia.

For the third and fourth one, you might be able to get someone to fix that if you search around for long enough, but it will take work.

Next time you buy hardware you may want to make sure it's supported with your OS first. Sadly that's still necessary in this day and age.