One suggestion I have is maybe switching out those minotaurs for some more 3*s. I imagine if you are lasting to mid game then you will either already be winning or the minotaur likely wouldn't be enough to save you.

I'd consider switching out to Marsh Walker asap. It is widely considered the best 1* right now when paired with flourish and shieldbearer. If you can flip some of your unused earned cards: Bronze Gate, Underbrush Board, Ornery goat, jaguar Staffs would be great buys.