I agree with Blackbeardpepe to a degree. I farmed NS as I thought they would be fun as well as pretty good. I am now regular top 5 in my Arena and am now farming Ewoks as I believe they will also be fun and are underrated.
Also farming Wampa and keeping one eye out for the DS Feb thing. Ultimately I think you will need at least 3 or 4 good strong squads to compete long term as the days of one META faction destroying all teams seems thankfully to be slowly becoming a thing of the past