I'm assuming you don't want to reuse any parts from the old pc and you're open to second hand (especially at lower budgets second hand is much more worth the price)
Psu: 2500 (Cooler master/Corsair 550w)
GPU: 12000 (RTX 2060)
Ram: 3000 (8x2 DDR4)
Case: 2500 (any of your choice)
Ssd (512): 2000
This leaves u with 8-13k to spend on your CPU+motherboad combo.
Most cpus like ryzen 3600 go for around 7k, leaving upto 6k for a mobo - B450 would be the best option. (This is if you can stretch past 30k)
Allow for some headroom for these prices, but these are usually what these parts should go for. All used, except case.
When getting a used SSD, make sure it has 100% health and make sure all the parts have warranty, and if not, testing warranty.