How about using the flag collection of something "accumulated" on the home page, like in the background behind the upcoming match up. We can see the Grounds expand and change, but at some point managers are probably going to ground every 3-5 days, selecting next build, and don't revisit. Would love really anything that increases the feeling of history and accumulation.

If it's adding flags to the background, it's not so dynamic... Maybe something that builds up close we get to match time, like a stadium filling with fans hours before a match, the ground crew painting the pitch, etc.

I'd like to see the Grounds tab used as a bit of a "hub". Team history or MVP historic players memorials at the club museum is the easy one. Maybe can read about tactics with another layer of depth at the Training Field. Or some media conference mini game to drive attendance between matches.

I really want to feel longer term connection, when my favorite player retires at 32, I'd be happy if I could sponsor a memorial, or throw a parade, or follow his career as a "coach" or get "Social updates" about his retirement in the tropics. An aspect of team motivation that persists over a number of seasons -player joining Barça has a different team history/expectation than joining Malaga. Some team to win league is huge, others to lose 1 competition 3 is confidence shaking.