Skill titles
Other games such as guild wars reward you when you max something out by giving you a title in text above your name, showing everybody that title, showing your mastery in that field.
For example you could display something like "bonecraft master" or "tailoring master" or "foraging master" above their heads after someone hits skill 100 in that skill, or while they have 100 they could have access to that as a option till it drops below 100.
Other games have this so there is a history of this in other games, I think it would be a good addition here as well.