You need to get those balances down if you can, that utilization is holding your scores down.
Bring down the balances as much you can.
Amazon store and disco could raise your limits, but more than likely
wont until you prove that you can pay them down.
Just make sure you can responsibly use credit.
Any time you use a card, best to be able to pay the balance in full before/after
the statement, and long before the due date.
When you carry a balance, you end up paying interest, which may sometimes
be necessary, however isnt good financially.