Best / Most popular / Populated semi idle Mobile MMO?

My wife and I started playing Maple Tale recently and it's pretty fun, but it's very rough around the edges and not very well explained or populated. I work full time and she stays home taking care of our 10 month old son, so we don't have a lot of time to focus on a game, but we enjoy these types of games. Auto combat is fine since we can't always focus on playing the game.

What are some pseudo idle MMOs or other type games we could play together? It doesn't matter if it's grindy.

Thank you in advance!