I lean into my alt-itis.
First, I generate the character - which could have any number of seeds to it from an offhand joke spoken earlier to book characters to OCs dreamed up on my commute.
Upon appearing in Atlas I hit the START vendor and pick up Mu and Nemesis Beatstick, the five Enhancers, and the x2 XP buff. Then it's straight to where the Hellions are raising hell (ha) in the west side (Once you're a Jet you're a Jet all the way!). Group up spawns and Mu them down. Gain a level and keep going, using the Insp buffs from levelling to push harder and faster. Keep this up til I ding 4, then go see Back Alley Brawler and level up, followed by street sweeping in Argosy til 6, maybe more if I'm having a good time. Then one of two things: if there's a DFB starting, I'll join that; if not, the character goes on the shelf to accumulate Patrol XP.
I cycle characters in and out of play as their Patrol XP waxes and wanes, doing whatever strikes my fancy at the time. I haven't joined in any PI Council shenanigans since the Council Patch, but if it's a character I've really taken a shine to I might park them in a dual-boxed fire farm.
I recently did this with a villain I've taken a liking to and now plan to use Ouro to go do all the redside content.