I used Manjaro for 1.5 years. It was relatively stable, with the exception its package manager, as it was buggy, especially with the AUR. Let alone using the AUR could create problems with packages depending from the regular repository. The holding back of repository also had another issue for me, as updates could take forever if they missed the update cycle of Manjaro. Also I didn't like the team much too. My point is not here to make look Manjaro worse or anything like that, just talking about my personal issues.

I switched way before the team fall apart, to EndeavourOS. And it is exactly what I was hoping from Manjaro to be, just closer to Archlinux. As to your stability issues with CachyOS. Do you think its the Nvidia driver (as you named your card specifically)?