Budget replacement for ancient RX580

So my old trusty workhorse of a PC is starting to fall apart, as my power supply just died, and now my GPU started cutting the signal from my screens if I game for more than 10 minutes, but I can't afford a brand new PC at this point, and honestly, this set up kinda works for me still, as I don't really play newer AAA titles.

I'm running a first gen Ryzen 7, and 32gb of ram, and I think just a halfway decent GPU replacement would keep me chugging along for a couple more years, until I can build a new one.

The problem is that I'm completely out of the loop when it comes to GPUs, so I'll need some recommendations.

Ideally it wouldn't cost much more than 200€, but 300ish could still be reasonable. I'm primarily looking to buy new, as I'm a tad bit hesitant buying PC parts used, but if there's some used cards that offer great bang for the buck, I'll definitely consider it.

Thanks a bunch.