Need advice on who to farm next!

Hi there folks! F2P here, I just proudly accomplished my first goal of my SWGOH career... I unlocked Padme at 7*, and got her both zetas!

Now i'm running a GR team as my main team in Arena. I have a 7* geo squad, with zBroodAlpha, which I built in order to get Padmé.

My next step is getting GK for sure, but now that i've finished my septs and geos grind i don't know what to farm next with all my energy! I was thinking to start farming ewoks to get C3PO but i'm not sure it's worth the grind right now.

Which direction do you think I should take? Who should I farm next? Here's my profile https://swgoh.gg/p/118919173/characters/

Every advice is well appreciated!

Thanks :)