Using credit card after paying off in full within promo deal


I have a few credit cards that I’ve paid off within the promo period ending. I am wondering instead of getting a new credit card again, can I use the same one that has the empty balance on it? Will the promo have ended and it will charge me more interest? Am I better to spend on the exisiting card so I don’t have lots of cards, or apply for a new one (already approved) for purchases? Thanks!


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