You can take over an existing lower level Club from the Manager tab. This will be a bot club currently in a league and playing with an existing match schedule. If you want a fresh start with a new Club you can perform the takeover at the start of a new season. You will remain on current server.

Note: if you do this your existing Club will be lost permanently: any Boosters and Tokens you have will be carried over to the new club but the cash will not.

Otherwise, as said above either create a new account and a new team or wait for the inactive process to delete your team.