Hankle Wong

Hi, I'd created and paid tax through self-assessment in last tax year. I am no longer self-employed in this tax year but I still have some foreign income to declare. I understand that I have to stop my self-employed status and continue to report for the foreign income. My questions are: 1. Do I need to re-register for the self-assessement after this tax year? 2. What if I had missed the 5 April deadline for ending my self-employed status? 3. Do I need to re-register for the UTR if I had found another self-employed jon in the future? Thank you.