Need help Powerleveling Gaige

Game: Borderlands 2
Current level: 56
Desired level: 72 then to OP 8
Console: PS4
PSN: BeardedMan01

I just finished my second playthrough with Gaige and have been looking to get up to max and then to OP 8. I have a few OP 8 weapons that I could offer for help but not many. Thanks for any help offered.