Finance question

I have 2 credit cards that need to paid off. Ones balance is $3,000 and the other is $400. Every 2 weeks for payday, I pay $100 to each card but it doesn’t seem to be lowering at all, since of course I start using them when my bank balance is low. I’ve been thinking whether it’s smarter to pay the $400 one off first and stop close it. Then start working on the $3,000 one.

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