Investment questions?

I am new to this game but have loved it and invested a lot early to catch up! Level 44 and I play a lot of squad arena! Have been top 5 everyday and I'll say it been a little tough since my power is typically a couple thousand lower. But i just unlocked Sid and luminara :)

My debate is should I invest in Poe or continue working on daka in cantina. I ask this because I now know Poe is still going to be relevant after the update. My other debate is should I invest in 4 staring phasma or luminara?

My arena team prior to acquiring Sid and luminara today has been phasma, kylo, Poe, maul, dooku.

Thanks for any tips!