Welcome Tadek Lamperski,
Thank you for posting on Microsoft Q&A. I'm sorry to hear you lost access to your Minecraft account. Losing an account you paid for is stressful, and I'll do my best to help you get it back.
To point you in the right direction, could you tell me:
- Did you sign in to Minecraft with a Microsoft account (for example an Outlook.com, Hotmail or Gmail address you signed up with)? Or was it an older Mojang account that you never moved to a Microsoft account?
- Do you still remember the email address or phone number you originally used to sign in?
- When you try to sign in with that email, what happens? For example, a "That Microsoft account doesn't exist" message, a wrong-password error, or a code being sent to an email or phone you don't recognize.
Looking forward to your update.