In all honesty, between going to school, saving his sister, dealing with girls and protecting them (they've been kidnapped... threatened.... suffered assassination attempts..), dealing with families that want him dead...
It's not like he can go missing three months to cultivate XD He literally has to do just about everything by himself.
BTW the moron who tried to have him killed is going to die. This MC will kill ruthlessly.
As a side note, having some stooges is probably a good idea. He can have them do stuff and check on things when he's not around. So I'm in favor of him actually having the stooges work for him.