A simultaneous campaign refers to the number of campaigns that are running/sending at the same time. The maximum limit is based on ACTIVELY RUNNING CAMPAIGNS.
The maximum simultaneous campaign for an account will be based on the account plan.
For adjustment requests, kindly reach out to your client success manager. You can also reach out to our support team at any time by submitting a ticket. Here is how: Login to your MCC account > Main Menu > Support > Submit Ticket