It can’t be done by the customer. Pinterest must do it - Convert business account back...
GetHuman610930's plan change issue with Pinterest from April 2018
Help with my Pinterest issue
GetHuman610930's next move: try the Pinterest help center.
Pinterest doesn't have a customer phone number that is answered by an agent. Instead, GetHuman610930 will want to follow the link below to head to their help center. We will check on GetHuman610930 later to make sure it's all set or try to help escalate.