Calin F

Hey guys,
New in this omaha world(3 months), trying to build my game. Need some help with my 4 bet play. For what I've been seening a lot of regulars have a pretty high 4-bet range 15-18% ; My range is 8% wich seems pretty low. I've been looking for some videos with this topic but failed till now to find some specific one. Any recommandation will be appreciated. Thanks!