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is nvidia-smi and lspci outputting the correct information about the gpu and the processes using it?
what happens when you try a game? i've had many issues with cinnamon+nvidia before even when everything else is working well, so its gonna be useful to narrow it down a bit.
your display is plugged into the gpu? then it should just work
You can use it with secure boot enabled. See if Mint has documentation. Usually it's just setting it up with dkms, and installing your cert to the BIOS.
The Debian docs were really useful for me in setting up my 3090 on Debian proper.
Since Mint is downstream, maybe they will help you.
Are you using wayland? No idea if there is cinnamon wayland. I have the same issue on gnome, the last nvidia driver that worked under wayland was 570. Since then, unfortunately the only thing that helped was going back to X.
wayland is incomplete on cinnamon iirc. i don't think they ship it by default.