Many clans reached level 20 and it’s time to expand clan levels to 30-50 so clans at the level don’t get bored. This topic probaly won’t be seen anyways but new clan levels are needed so please add them in near future.
50 is the last maximum level in real coc 
So what’s the use? Prove yourself to play for a long time?
No ideas about it.
Hmm_-
No, so clans don’t just die at level 20 because they can’t go further.
what he refers to is that his clan reached the maximum level of experience