re register for self assessment (property income)

I was receiving income from property. The income stopped as of 05/03/2024 and I filed the online form to HMRC as I no longer need to send a tax return. The problem is I should have done this at a later date! I still have to pay for the tax year 2023 -2024 but I can't file a return as HMRC say the return has been submitted. I have tried to reregister to access the self assessment form but keeps coming up it's submitted. How do I cancel my request to opt out of self assessment so I can file my return for the tax year 2023-2024? Presumably once I've filed that I can then fill in the online form to opt out next year. Your help would be much appreciated!

Hi,
You will need to contact the Self Assessment team to have this reopened to allow you to file.
Self Assessment: general enquiries 
Thank you