Gey, everyone. Thanks for your opinions. Here is what I decided to do. I will mostly buy from gog, if game isn’t on gog then from steam since after considering.

Well there are 2 plugins for setting card prices, steamdb and steam enchanced. They both allow you to set card prices to price that will get bought quickly. Also there are many people who buy them to finish their card collection

You sell them on marketplace, then for those you get your currency on steam wallet, then with that you can buy games. You can also sell other inventory items as long as game uses steam inventory

Well for me price isnt a problem since for me on both platforms games cost similiar, gog for me is local buying though

It’s is possible to download using certificate that’s is extracted from switch? How?

Game sounds interesting from what you wrote and what I seen on steam