Why do you have to buy a new OS? What did you have before and why can THAT not be re-installed?
I have a lot of jump drives I back my crap up on...I really need to buy am external hard drive I can just plug in and back my stuff up on. But the good news is at least you CAN back up your stuff...tedious but doable, so you lose nothing.
Technology isn't always the greatest thing, but I have to say having an IPad as a back-up has saved me more than once when my PC decided to not work for me. I can use the internet and play various games on it in the meantime while dealing with my PC. If you can invest in an IPad Pro + Apple Pencil, with a good drawing app, you will have a gaming/art device as a back-up that you can also take anywhere on the go.
I know you don't hate sushi...I know what you meant to say. I don't approve; you must keep fighting.