Yes, this idea has been done, but it is good that you are thinking of ways to improve the site. Instead of coming up with a one sentence idea, elaborate more. Explain why these would be good to have.
it would be great to have new ranks because it would be more challenging.
It's challenging as it is. It's quite difficult to have the patience to become Gold King, let alone other HIGHER ranks. The ranking system is great; it's competitive, difficult and of course fun
new rankings like bronze villager 10 AP points or like gold masters 50 000AP points!!!
Wood serf is already at 10 AP points, don't even think about 50,000, and yes, there were millions of threads on this anyways. Search before you make a new topic. Thanks.