Alright, I bounce between the UK and the US a lot 4-5 times a year, and in the noise of other things (like aligning tax obligations every year), I lose sight of how else to optimize my finances.

Following the templace:

• Current credit cards: Citi Thankyou Preferred (US; limit $15,000), Barclaycard (UK; limit £5,000)
• FICO: 784
• Oldest account: 8 years on the citibank card
• Income: $230,000
• Avg monthly spend:
  • $2800 rent, $200 other utilities
  • $1000 travel (averaging this a little; it's bumpier depending on when I book flights)
  • $500 groceries
  • $300 delivery, $300 restaurants/bars
  • $100 fitness
• Business cards: probably not?
• Purpose of next card: want to optimize kickbacks
• Other cards I've been looking at: none; slight preference towards staying in-house with citi
• Category spending: probably ok

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I've got this old Citi Thankyou card which still nets me some money off via Amazon on a semi-regular basis, which is neat. I imagine it's not optimized for me any more.

I like the idea of regular straightforward cashback as a kickback, but perhaps I'm missing something that way. I see also various AAdvantage cards, i.e. tied to American Airlines, and I typically fly BA. Which makes me wonder if the AAdvantage cards are useful to folks who fly with other members of the oneworld alliance, or if that's all just far too complex. (I have no desire to find out the hard way that such points are eligible only on American, and not on BA. Experiences welcome!)

My checking account where my salary is paid is also Citi, and then I put savings/investments elsewhere. For simplicity, it'd be nice to understand Citi's credit card product line and stay in-house, but I'm not opposed to going elsewhere. I pay off the card every month and I don't go near the limit, so I'm not concerned about finding the highest limit.

Preference towards cards without fees, unless there's a clear advantage as, say, a regular traveler.

Thoughts or primers welcome, please! Every time I try to look at the market -- either just at Citi's product line or via something like nerdwallet -- I'm immediately caught out by decision paralysis.

Thanks!