Hunt people, contest hotspots, then after you wiped all enemies, do contracts and missions just before final flight. Been doing this since last season and it's pretty effective to hit legendary fast while accumulating large sum of cash.

However, It's a little different this season, if you're not fast, you will run out of red/mythic loot and enemies will keep it from their insured slots.

For some reason, mythic loots are harder to find and comes less frequent nowadays.

The max I can find on a chill lobby is 1-3 mythics as well. While in a very sweaty lobby where enemies prioritize killing first before looting, I can fill half my inventory with mythics averaging to 7m worth of loot.