@djvogt
Will need to go thru your posting and create a new topic with each mentioned element..
@XCountryToo call support back and tell them to help you with the exceeded maximum number of datasets issue. Don't mention the add account issue. Try the add account after you get the dataset error cleared.
Theoretically you should always be able to add a new account, even with a lapsed subscription, provided that you add the new account as an “Offline account”: Start the Add Account process ("+" icon in the Account Sidebar title) and click the “Offline account” tab at the bottom of the window. Follow instructions.
Please let us know if you can make this work for you.