The points needed to activate A.I.S. are 200, 7,000 and 10,000 actually. But for other points, I agree with ERICK001BC.
If I set priorities, my opinion is like follows.
Destroy Falspawn Particle Batteries ASAP. This takes higher priority than dealing with bosses.
Collect positive crystals. This is rather a requirement for the next two points. We want to have 7,000 points at least, to activate the A.I.S. for the 2nd time. If we could have 10,000 points, that's great but not necessary IMO. The best MPA I could join finishing with 90.17%, didn't reach 10,000 points, so we can do well with only two A.I.S. activations.
All participants ride the A.I.S. to their full allowance.
All participants use tower HP recovery 3 times. The 3rd recovery is unlocked at 6,000 pts.
I don't expect everyone will do these, but if the MPA could collect 7,000 points and 10 players did these minimal duties, that means 20 A.I.S.s and 30 tower recoveries. That's enough for at least clearing this UQ, I think.
Adding to these, the in-game tutorial (Main Menu > System > Information > Check Tutorials) is always helpful to check the basics