Hello, @mariangio,
Sorry for the inconvenience but this issue is independent of our theme but to your server, please read the below-listed articles and try to reach out to your hosting provider to fix this issue for you on your site.
https://blogvault.net/cant-access-wordpress-admin-login/
https://wpbuffs.com/tips-and-tricks-to-recover-your-lost-wordpress-password/
Regards 8Themes Team.