Help me try to climb the ladder.

So, I've been playing for sometime now and for a long time my strategy was to keep all of my characters at close to the same power (ie, always gearing the hero to the right)

In doing this for so long, I find I have nothing hot for arena and dance around rank 400 - 200.

I'm hoping I can get some insight from the pros to try and help me climb.
https://swgoh.gg/u/hipsuppsi/collection/