No credit card required
Browse credit cards from a variety of issuers to see if there's a better card for you.
It's not really that big of a deal. Your overall utilization is what's a concern, not so much an individual card. It would have been an issue if it were your only card but it wasn't so no harm no foul. Utilization has a short term memory, once you pay it down the short term damage is undone. In your scenario, the only one you need to worry about pleasing is Amex and you appear to be a great customer to them, so don't be so hard on yourself hope you have a great trip.
Glad it worked out! I used to have 2 Venture cards and that was tough at times. They were both about 15k limits but I would use one to carry 0% and the other as a daily driver, switching their purpose from time to time.
When I finally made a 2k charge on the card carrying a 5k 0% balance (and was about to cut at the worst possible time), I grabbed a sharpie and wrote V1 and V2 in big black letters on the front of each. Worked like a charm, lol.