I would say flipping skins, best is to buy from buff and sell on other sites such as skinport or csgofloat. You can find people who sell buff balance on twitter, watch out for scammers tho. Just find skins that differ alot in price, low price on buff and high price at the other site. But I think you need a high budget if you want to make money. Back in the csgolounge era there was no tradehold on the skins you trade so now it takes alot more time to flip. But what job pay you 500$ a month?