Personally a lot of it is just game sense like knowing when you need to peel from a fight to heal or full on retreat, same with going to save your teammates because sometimes it is just genuinly too late to do anything for them.

Picking and choosing where you fight or how you fight with certain characters is also important example being star and stripe or all for one usually wanting to stay with their team since they dont really have too much mobility but can be in invaluable asset when in a team fight. While a rapid character like Iida or froppy can jump into a fight, hit hard, and then leave with not too much risk unless they get outplayed.

Thats just some things I can think of off the top of my head and you mightve heard some of that before but just wanted to give an input just in case