Help building a team for Arena

Hey all,

I am still trying to figure out whats the best arena team I can do, with my current characters.

https://swgoh.gg/u/kingmemphis/collection/

I've been at best, rank 6, but lately hitting around 10-15. I want to maximize my team so I can hopefully get to top 5. Any idea on the top 5 characters I should pay attention to?

Thanks