40bi+ power, several months played..

And I still don't have any red S equipment. Am I doing something wrong or it's just this slow? All my equipment is yellow +3, but that's still a very far road to red.

I'm f2p but I play every day and I try to get the maximum rewards from events and so on. I know there is an equipment swapping system but as far as I'm concerned I still would need another red S equipment (right?), so it doesn't help.

Any tips would be appreciated 👍🏼