Guild Officers: Like the leader but the leader has the ability to promote and demote team members, officers can help manage the guild as well but cannot kick other officers out.
Maybe increase guild members to 30 otherwise (and have officers)
Guild 'wiki'- like page, which is editable by officers and leader only, where the guild's 'tips' are put on to help players in their own guild
Have a league chat and a guild chat (maybe put the chat on the bottom of the screen and when you open it becomes a larger screen (increase word count) and stuff, and include emojis and stuff
As for coins, they become useless once you've upgraded everything, but you need tears, so maybe implement some way for coin uses i.e. buying tears with coins ( 10,000 coins for 100 tears or something) or some other use for coins