V C

Hi About a year and a half ago I got a nudge letter from HMRC to declare income from selling things online a few years before 18/19/20 I submitted my disclosure for all years 2018-2023 just in case and paid what I owed plus interest. My question is since I never registered to be a sole trader/self employed and I have not sold anything since my declaration 03/23 do i need to submit a self assessment for 23/24? I am so confused as I can not even notify HMRC I am no longer trading as I do not have a UTR Many thanks