I have already paid for minecraft java edition but I'm being asked to pay again from the new update of the launcher, it sends me to the minecraft demo

I paid a few months ago for the mincraft java edition game but since the new update I can no longer play minecraft because my minecraft java edition has switched to demo minecraft while on the mojang site I cannot repurchase, it suggests to me to reinstall it, I uninstalled the launcher 5 times and I redownloaded it 5 times and yet I am well connected to my microsoft account.