Crypto Tax in UK

I’m new to crypto. I started in May 2024. I just need some advice. If I don’t have any gains at all, do I still need to file a report to HMRC? I’m actually at 70% loss at present. I think don’t have to, but I just want to make sure ‘coz I don’t want to be charged for penalty.

I hope you can help me. Thank you so much in advance.