General Advice needed: Return of Palpatine event?

In order to give you constructive advice it would be better to know where the gear levels are on your rebels and droids. Gear is much more important than star level. If your droids are nearly max gear then I would be working on gear for your rebels while you finish starring up your droids.

A 6* max geared hero is a minimal difference to a 7* max geared hero. Keep in mind that many stats are only increased by gear level and star level has no effect.