My realizations

So yeah, I'm not a beginner in gacha games but I'm new in otome games, I'm playing Ids for 3 days in a row and now I'm at chapter 5 already, what my realizations is i should've just save the resources and didn't upgrade 3 star cards, and also! I should've just focus on one man in upgrading, Cause i thought you can put all the men in just one team! But still since I'm just an F2P saving up resources and upgrades just for my one man is indeed necessary hahaha I'll be focusing now on my Rafa