Maybe start focusing on getting more dark side characters. Sideous is great but the night sister acolyte is gonna be pretty much useless in the tougher battles. I definitely suggest farming phasma shards from the galactic war shipments as well as maybe ventress from the arena shipments.
I barely made it to the rey node in the dark side hard path and my team is
5* Phasma
4* Vader
4* kylo ren
4* ventress
4* dooku
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I still have the characters that can promote:
I barely made it to the rey node in the dark side hard path and my team is
5* Phasma
4* Vader
4* kylo ren
4* ventress
4* dooku