Help with figuring out a cheap computer to play raytracing games

Here are my specs:

Processor AMD Ryzen 5 3600 6-Core Processor 3.59 GHz

Installed RAM 16.0 GB

Storage 224 GB SSD ADATA SU650

Graphics Card NVIDIA GeForce GTX 1660 SUPER (6 GB)

System Type 64-bit operating system, x64-based processor

It's been working great, but I would very much like to upgrade since I really want to play Doom The Dark Ages. I'm completely fine with having to play on low to medium settings if it means 60-120 fps on demanding games like that. Any help would be very much appreciated as I'm not very knowledgeable on this