What cpu
What cpu
The only option here is to save up and move to a Ryzen setup. A 1600AF on a B450 board works fine, but you’ll also need new RAM.
You’ll likely need to replace both the CPU and motherboard. A Ryzen 1600 AF paired with an MSI B450 Tomahawk Max wouldn’t cause any performance issues and would stay under $200 USD. Don’t forget about RAM!
It seems like you're suggesting patience is wise since funds are limited.