Who/what should I go after at this point?

Id suggest focusing on SLKR as it looks like you already have a lot of his reqs ready to go (or very close). While you are working on the ship shards for the SLKR event I'd recommend unlocking Malak because you have to be close to that too.

Given where you are at now id suggest getting SLKR.

then go get the Executor.

SLKR, then Executor. After that, get your CLS team (CLS, 3PO, 3PO & Chewbacca, Chewbacca, and Han Solo) up to relics. It’s a team that will serve you well no matter where you’re at in the game.