Aye once you're in self assessment you'll keep getting one each year. You can keep checking on the hmrc website if you don't need to do one for next year
https://www.gov.uk/check-if-you-need-a-tax-return/y
if you feel you dont need to then you can call the tax helpline, they'll go through your details and send a referral to close your self assessment record if they need to.