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Okay, for starters, unfortunately your team comp is just terrible. You lack a consistent atk down, and basically have no def up or ally protect. You have leech from Mikey, but with a 4 turn cooldown so you can't have it consistently active. And you're not tuned at all.

Tbh, my guess is tuning is going to prove difficult to do for you, so, I'd probably just abandon that idea and focus more on a proper team comp. Seeker is good, but because of his extra turn, keeping buffs active on him is very tricky, so you need to build him tankier than you otherwise would- probably want his def to be closer to 4200, and hp above 60k. He can stay on the team since he'll help your other champs do more, but he can also be dropped if necessary. 

Drath is almost completely useless on this team. She adds a bit of healing, which should be entirely useless if you can keep leech consistently active, and does nothing else at all. Drop her.

Mikey is mostly useless. He can't keep his a3 consistently active since it's on a 4 turn cd, unless you tune him for a 4:3 comp, which is gonna be tough. I won't completely discount him, if you want to build a 4:3 comp he can work quite well, but you need to read up on tuning that if so.

Ezio and Geomancer can stay. They both do their job well.

So - overall my suggestion is to drop drath and Mikey, and add someone with a more consistent leech as well as someone with def up and/or ally protect. Seeker can be dropped too, especially if you can double up by getting the other one of those two (def up / ally protect).