Add more monster, at least you should have 9 monster on the deck, and why you running CV when there's no lv.7 or higher normal monster ? change that with 2-3 rare metal to support sergeant/barrel. Run only 2 berry and add 1-2 dian keto is also a good choice, because if barrel or joan attacked, you can't use berry in the next turn if your oppenent LP is lower than yours.
Thanks people..actually i realised the cv thing in the first duel xD
These are the changes i made after getting a 2nd e-con and that dragon from the event