I'll say what i said the last time and even add a suggestion.
Remove the mentor system and add a help/global chat.
As for icons how about this.

PvE: Complete all the available raids/trials in all dificulties.
PvP: Achieve Diamond rank at the feast at the end of season.
Gathering/Crafting: Have all craft/gather profs at 80 with X% of recipes crafted/materials gathered.
Master: All of the above. who , ending in top ranks in pvp or having.

That way having an icon actually means something instead of the current joke of a system mentoring is.