It's a gradual process, don't worry about it.

If you're concerned about using one team all the time getting stale, how about working on 2 or 3 teams, depending on what the gacha gives you?
But it really comes down to you having to weigh rate of progression against how much variety you need to keep logging in months later. A bit of time spent on figuring out your own tendencies can provide direction in situations like these in the future.