OCONUS advice

Hi! My husband and I are PCSing to Osan this summer and I’d love some guidance on optimizing our financial setup before we move.

Current setup:

• AMEX Platinum
• Chase Sapphire Reserve
• AMEX Delta Skymiles Platinum
• Costco Visa (5% gas, 3% restaurants)
• PayPal Debit (5% groceries)
• BoA Cash Rewards MC (3% online shopping)
• Discover (5% rotating)
• Insurance: USAA
• Checking: BoA (open to switching, it's just been fine for our needs and we have had no issues so far)
• HYSA: Ally

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My questions moving forward:

-What credit card moves should we make? Been looking at the ones where we'd be able to get the SUB (aka not AMEX Gold, BCP)… so something like the Marriott Brilliant or Hilton Aspire? Korean Air Skypass?

-What banking moves should we make? Trying to take into consideration both the OCONUS move but also long-term. NFCU since there's a physical branch on base? Schwab for the ATM perks?

We know there are “better” setups out there, that’s why we’re asking. Trying to make smart decisions before the move if we can. Thanks in advance for your kindness and your help!