I think the mentor system really needs to be reworked heavily. Too many mentors aren't interested in teaching anything and are only in it for bonus so I reckon taking away the crown and extras and replacing it with some other system would be an improvement. Any change to be honest to try and keep only the mentory mentors would be good.

Personally I'd love to see some kind of mentor stall in cities where new characters can go to ask questions about the world, crafting and other stuff; you could be given a special bubble view around the stall as a mentor and that'd be the only perk. And then take away the crown but have it shown only in dungeons, and maybe only if new players click to let mentors in.