Is this the best way to earn miles on overseas spending?

Will be gg on a family holiday soon to NZ. Wanted to get a sense check if this method is feasible:

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• DBS Altitude for hotel bookings and flights (reason behind this is the $5K cap/month, other cards that give 4MPD have a $1-$2K limit)
• After maxing out CITI Rewards (paired with AMAZE), I'm considering DBS WWMC for general overseas spending.

Am I overcomplicating the process with 3 diff cards? Appreciate all advice.

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