Need to replace my GPU so I can work

Hi my name is John. I currently live in Bali, Indonesia.
I lost my job because of the pandemic and it made me switch my lifestyle drastically.
As an expat, its not easy getting a job here, especially at a time like this so I resorted to doing freelanve online work.
With the money I saved from my previous work, I bought a 2nd hand PC. it was working fine for a few months but then it started crashing randomly when I'm rendering videos. Long story short I need to replace my gpu and Im short $300.

I currently have a galax 2060 super and I would want to get the same (different brand) so I can continue to work and survive. I currently have no other means of earning money other than the freelance work I get using my PC.

Any help would be appreciated.

Thank you.

John