Cinnamon on mint has an option to log in using Wayland.
Where you type your login/password (mint uses light-dm as the login window) there is a small icon/avatar to the right. Clicking that gives the DE options:
- Cinnamon
- Cinnamon 2D
- Cinnamon Wayland (experimental)
Since pop is Ubuntu based you could try the Ubuntu ppa (there are other nvidia tips here, too)
https://itsfoss.com/ubuntu-official-ppa-graphics/
And, here's the 550 download directly from nvidia
https://www.nvidia.com/en-us/drivers/details/233004/