Roster Review for 1.3 GP Early Game Player

So, obviously you want to get your StarKiller team up and running.  I see you've already acknowledged that Emp Palp is necessary for him.  The other thing to note is that he's reliant on omicrons.  On him for Grand Arena and on Mara and Juhani in Territory Wars (if you decided or requested to go that route (TW omicrons)).  In GAC, only he, Mara and Palp are important; the lightside pair don't really matter, so go for units you need for unlocks, Scavenger Rey and Old Ben for example.

For your squad competence,  I see you're forming a nice Phoenix team with Captain Rex.  You're also getting there on a very nice early and late game team of Traya and Savage.  With the omicrons in Grand Arena this team does not fall off, and can be used at the very highest level.  So, if we aren't considering what's next on your path of unlocks, these 2 teams will help you out a lot.

You also have a 7 star mandalorian.  He's good for the Chewie unlock and a very potent character.  There's scope there too.  However, Bounty Hunters are quite hard to use.  They can get totally turn metered out of matches.  Meaning, they'll die before they get any turns or get anywhere near their BH contract.

Right now, you're absolutely no where with ships.  Ships are extremely important.  This is the main way you obtain crystals via your ship arena.  Ship arenas are usually very tightly controlled by the players at the top.  You need a meta fleet to compete with them.  Make sure you aren't doing anything to annoy players in Ship Arena......that's like getting a tattoo you regret.  Hard and sometimes impossible to fix.  Only climb near the top when it's for your daily payout.

I'm not seeing any mods on any of your characters.  Modding and the skill behind it are vital parts of the game.  Farming mods is a daily thing, you never have perfect mods and they should be continually worked on.  Only 5/6 dot mods are worth your time, however.  So, possibly you can't farm 5 dot mods yet.  For modding characters you can google  'swgoh.gg  best mods for starkiller'  for example.  This will give you mod sets and primary skills good/best for this character.

As for how to progress your account.  I don't know, there aren't any 'bad' unlocks.  Eventually, you'll want every legendary, legendary ship and galactic legend.  It's best to pick something close, that will lead to your next unlock.  However, you always want to be working towards unlocking something big.  The bigger you aim, the better it'll affect your account, but the longer it'll take to unlock.