Basically, I haven't been here before and know nothing about the meta. currently my team is the new Haku and the 9* from the valentines collab as leaders, with a couple of the 5*s from the same and Sonia Fio as the rest. I also have mega awoken scheat and hitagi from the new collab. I used both of my 6* medals. I can do fine (can almost no-stone annihilation stages) for where I am, but have ~140 stones to burn. What should I do? (as in, are there any characters to nab/any way I can effectively get gems without waiting that I don't know about/any way to grind stones)
(I have a brother, he's not actually great at following advice I think would be good, but he's got a bunch of good units and I could probably convince him to lend it so I can beat harder stages.)