A few points doesn’t matter much — unless your on the edge, and applying for a mortgage, car loan, or life insurance. Keep paying those cards down to zero balances, then charge and pay in full every month. That will keep your credit score high.
The formulas change, and having more “open credit”can sometimes change your score a few points. That’s not the real issue. Long held cards, plus regular payment in full, can really boost your score the most.