Best XP method?

Finally pulled the trigger and got the game. Beat it, loved it, want to endgame. I’ve only got roughly 1-2 hours every other day to play with my current responsibilities. My Rafa is level 51 and I’ve been doing vile bounties to level along with unlocking the rest of the map I missed, but find it not as fun as actual mobbing or farming. Is there any better way to level? I played only 3 side quests my whole play through so would doing those be more efficient?

I want to try the other Vault hunters but if the leveling process post lvl40 looks like this, I’m not super motivated to sink time into it.