Going into The Defenders, Matt is going to have to learn that he needs help, that he can’t do all this alone.
So, whatever lessons he learns in The Defenders will then play into I think Season 3 and how he goes forward from there.
According to actor Charlie Cox, it sounds like the Man Without Fear will get a specific lesson in crimefighting during The Defenders miniseries that will carry over to his own show.
He had two pairs of trigger-happy helping hands in the Punisher and Elektra in Season 2, and one presumes the stakes will be raised even higher for Season 3.