I'm level 49 after a weak (and of some investment) and the team I currently have is:
Lando Leader 5* - Cantina node farm
Jyn 4* (Pack, very lucky - but can only farm from guild shipments and she's on and off it so fast I worry I wont get her 5* for Palp event)
Stormtrooper Han 5* - Arena shipments farm
Boba (Amazing!) - Cantina shipments farm
Then I go for one of; Geo Soldier 3* (sick damage), Biggs 4* (not really using until Wedge), Jedi Consular 4*, Royal Guard 2* (Amazing; stun chance as basic, defense & health boost special and chance for Turn meter increase, and auto taunts whenever someone goes -50%hp).
Depending what I face I use RG/Geo/JCons. Jyn & Lando are awesome together but I wouldn't focus on Jyn as I got lucky obtaining her from a pack, everyone else in my team is farmable/attainable from free to play I believe, and you could swap Jyn out for any of them, probably Consular as he is the most versatile with his team heal, self heal special (based on damage) and his basic damage attack (chance to reduce cooldowns by 1 - great for the team heal).
