So I was thinking, if you really want to have less shitposters why not change the ranking requirments, make it even harded to level up so shitposters stay away.
Make it something like this:
Rank Required activity Required merit
Brand new 0 0
Newbie 1 0
Jr Member 80 10
Member 120 50
Full Member 200 150
Sr. Member 300 300
Hero Member 600 600
Legendary 1000 1000
Copper Memb. 30 1
Do you want to make this place empty if not already? New users would not register here anymore. Users would be left here would be the enforcers and the shit posters.