You can do 90% of a restart yourself. Simply delete all of your databases using CPanel -> MySQL Databases and all files inside of public_html using CPanel -> File manager. Do NOT delete any file inside of your user folder (/home/USERNAME).
Other than that, only things like FTP users, email accounts, and other services for your account are not reset. Note that when you delete files and databases, you will permanently losing all these files and databases.
If this fails to correct your account, please post back in this thread so that we can assist you further.