If you struggle with buying too much stuff just because it is on sale: remember that when you don’t buy during sales and only buy what you want to play immediately, even full price, you are paying less overall.
There is just no point in hoarding. Whatever you bought and didn’t play immediately is gonna be on sale again. So either play it within the next two weeks or so or don’t buy.
I’ll throw a caveat on certain things that get delisted…this is my biggest poison on Steam. Just grabbed Forza Horizon 4 because of its announced delisting in December.
Otherwise tbough, solid advice!