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You can reheat pizza twice. In fact, you can reheat pizza more than two times.
But be warned the more you do this, the less satisfying the taste. At least heat it properly in an oven so you have a crispy crust. Heating a pizza using a microwave more than once is going to end badly.
The most obvious solution is to order a new pizza. You can even get a prepaid card through the link below to help pay for it.