Since you have already paid for the Deluxe edition the tax return cannot be cleared and started over with a less expensive edition.
You will need to contact TurboTax support so they can assist you in removing the Self-Employed edition.
See this TurboTax support FAQ for contacting support - https://ttlc.intuit.com/turbotax-support/en-us/help-article/account-management/contact-turbotax/L2y9...
Support can also be reached by messaging them on these pages https://www.facebook.com/turbotax/ and https://twitter.com/TeamTurboTax
