Hey, 5% is great for a single person in a 20M guild. Just 20 people with 5% p2 teams can do it. Like someone said though, you may also want to run your Resistance in p2 to help out. Try to make it a group effort at this point rather than expecting people to solo phases other than 1. P4 is easier to take down than p2 because there's less health and the tank only gets one turn after topple instead of two. So high survivability teams can work well there, and more people can contribute.
I think you are likely to have BB-8 since you have that FO team, but not sure who else does. 7* Ackbar and Ventress may be as much as two months away for you if you haven't started yet, but that may still be a good idea.
What would be really helpful is if you could post not only your own swgoh.gg account, but also mandate that everyone in your guild get one. Then people can look at your guild page on swgoh.gg and tell you how to best coordinate your people.