I personally would. If you have everything of importance backed up, have the bandwidth to download your games at a decent speed and the time to set everything up there’s no harm in a full wipe and reinstall, especially if you have being using the PC a few years.

I don’t know what you tried but if you still want to tinker with it have you checked for BIOS, GPU, Motherboard updates, Nvidia Drivers, Running your GPU at stock settings and games at a low setting to see if they work and if it is an OC problem. Go through your BIOS setting or reset then back to default if you have made changes there before.

Check event viewer after a crash to see if you can get any information from logs on the crashes.

I’d be happy to help troubleshoot if you like but if you feel competent to do a full wipe and rebuild go for it.