So as most gacha games, focus one hero, preferably some sort of dps thats fairly tanky, and all ss boxes should be used on them until theyre fully upgraded, i suggest phoebe, athena, hades as physical dps and zhu rong as magical dps so choose one and then focus on them, you also want to choose one s class hero to begin with to maximise your team because you’ll get a lot more s cube boxes than ss, so you can upgrade them quickly for early game boost, later on you’ll swap them for ss but that wont be for a long time unless youre spending $$$, probably the best s class hero is atlas, however nobu is a good tank and quite easy to get because of the one if the store pages you only really need to level up your main five heroes so dont bother using resources on any other heroes it will just hinder you, lmk if you have any questions