Can I cancel ISA if I made mistake and keep the allowance?

Dear Sir/Madam, This is first year using ISA accounts. I subscribed my full allowance to a fixed rate ISA but withdrew everything 1.5 months later as I realised this was not what I wanted. Am I allowed to cancel this cash ISA and agree to pay tax on the small interest accrued and use my allowance for a S&S ISA or is my allowance used for the year and I have to wait for the next year? Thanks in advance for your feedback

Hi klyveld,
If you have invested the full 20k for this tax year you will now need to wait until after 06/04/25 to open/deposit a new one.
Thank you.