I'm not arguing that this will necessarily fix your woes as I have no experience with any Nvidia hardware but one of the greatest but in hindsight obvious discoveries I made with regards to management of my Arch based system was discovering how to downgrade packages. Once you know how to do this, it's a lot less painful having to deal with broken updates - which are pretty rare anyway.

I personally cannot stand using Ubuntu and it seems I'm not alone in that regard. I hear nonstop issues with it from my friends who tried it and I attribute a lot of failed Linux converstions of people thanks to it.

https://wiki.archlinux.org/title/Downgrading_packages

Same exact experience here. Now I get why people told me to avoid rolling release distros.

I used Manjaro entirely because of its i3/bspwm DE versions. Ubuntu now has a good equivalent in the form of regolith. Avoid Manjaro if you care about long term system stability