Obligatory “not a developer, just a user” disclaimer.
Sounds like your .env file may have been altered somehow. Check to make sure APP_URL is correct for your domain. Also check the mail settings for MAIL_DRIVER, MAIL_PORT, MAIL_ENCRYPTION, MAIL_HOST, etc.
It was in the .env file but it was something else, I’ve added the queu data query or something like that and that messed up the file for sending emails.