Clan Levels (Hear me out)
Now before I start I don't know if this has been done before and I checked the ruled out section and it is not ruled out.
Alright my idea is pretty simple. Clan Levels! Like your player level, your clan would have one big level that every can participate to get higher. How it would work is when you participate in a clan war (You get xp even if you do lose but not as much as if you would win) you could get a little xp for every battle. Also donations would count towards your Clan XP so people might be donating a bit more if they don't already. Now I know this isn't a groundbreaking idea and it probably will never be added but, Let me have my fun and let's see how this plays out.