You will have to look at the second hand market for sure, but you can probably get a decent 1080p 80-100fps medium/high build.
Something like (or equivalent):
Ryzen 5 3600
RX 6600
16GB DDR4
1TB SSD (probably not NVMe)
Whatever case
Whatever monitor, even if only 60Hz, for now
Whatever MoBo
Tier A PSU from the Cultists Network PSU tier list
You can most likely get everything used if you buy from a second hand shop that has a form of buyer protection (eBay and similar) and thoroughly check and clean and test everything you buy