Crypto taxes in UK

Any Crypto Guru's that have any tips for me? Basically I owe money to HMRC for income tax from crypto even though i have lost my money in the end lol, it's just that it happened on different tax year(few months difference). This shit is not fair, I really need some advice. I'm supposed to file a self assessment for the year 2024-2025 tax year and lost my money in August 2025. Anyone been through situation? Would love to talk to someone that's been through this. Any way to get out of this shit situation, i'm having a headache.
Edit: I feel like even though i have registered for self- assessment before i had to, they would've found out anyway? Now, exchanges are reporting to HMRC and i received emails and text from Binance to do my taxes (clearly because they are reporting it already to them). Can someone confirm that they are not registered and an exchange is asking them to do it? I'm pretty sure HMRC will contact them soon if they don't ,lol.