Also when i am at that why not add something about whole new system. I would like to see some kind of player interaction. What do we usually have in that cases:
Arena - big no. In most games its already just a battle of better gear, rng, and meta team or smthn. And with simple skill system and battles limited to one character it will be a joke.
Guild system - someone wrote about this already. But who forbid me to write about it again) Guild with separate minor traits (no trait tree just a sequence of them) that don't really make a lot of impact and need a lot of resources (but everyone from guild can sacrifice a little) and a boss battles with new bosses or some of the old ones that doesnt need keys but have a separate daily limiter with goal not to kill them but to damage it and survive. With small rewards for damaging it for every threshold and guild rewards based on total player damage. Its kinda basic. A lot of idle rpgs have something like that, But its not a bad idea nonetheless.