Regarding a 5800X3D. I've been considering moving my rig to a 7x00 series right now and I have a great 5900X + mobo + ram config (or if you just want the CPU), I could let it go for cheap.
I upgraded from the 3900X to the 5900X when the opportunity came around, and it was a small noticeable upgrade, but my new display situation has pushed my CPU needs even more.
#2 and #3 would be the cost effective way of managing this. I've been debating #3 myself, but its annoying right now to turn off game mode based on what I'm doing with my PC regularly. If there is some type of annoying issue
It sounds that equivalent for you is the bootloop issue which I'd consider the following options to get it addressed:
BIOS update (duh) - do a clean clear CMOS and reconfigure your settings.
Do a complete CMOS/EEPROM wipe with a battery pull + jumper clear. Also check your PCH temperatures, I had to repaste motherboards heat spreader because it was overheating initially.
Do you have fTPM enabled with WIndows 11? That caused a lot of issues with me, and might be another source of problems.