Minecraft demo bug

Like every day, I wanted to play Minecraft. I turned it on, waited for it to update, and something that never happened happened - always, normally or after the update, I immediately started the launcher. Now, however, I had to log in. I didn't remember the password, so I changed it for a new one, logged in and had access only to the demo version. Already the second day I have access only to the demo version, and I would like to play on my worlds, so I have already written on various media about this problem, but there was no answer that could help.