I reinstalled java, reinstalled minecraft, but nothing happens
Write to support.
I didn't like it because sometimes it works again and because I feel too young
It doesn't matter at all. Write to support.
I also let him do it and after a few minutes everything appeared, otherwise reinstall the launcher (.minecraft folder is retained)
Shut down the computer after you have uninstalled it and then restart everything
Restart your PC and make sure that you don't have much else open, such as other big games. I had that too, after a restart everything went well.