Best gameplay loop for aUEC in 3.19?

What's the best way to build up aUEC in 3.19? I've played this game a bit, touch and go for a year or so. Is bounty hunting still the way to go? Bunker missions? Mining? Something else?

I've mainly been doing bounties and bunker missions with some friends to pay for my ship upgrades for the third time, but only spent a couple hours so I'm not too invested in any one path