actually this is no combination of the other categories.
to get this up, or to keep it up, you must stay busy as a manager.
You have to DO things on regular basis.
This could be buying a new player or selling a new player. these are sure to work.
Also expanding your arena works for this category
I'm less sure about the following, but I think they also will work:
changing training
changing staff
changing line-ups and tactics
I'm positive it has nothing to do with how many times a user logs in to the game, however if a user doesn't log in for 2 weeks, he can't actually DO anything in that time either... so make sure that when you log in, you actually DO something with your team.
If you never change anything, your fans will think you don't care and leave them be...
They are not your friends; they dispise you. I am the only one you can count on. Trust me.