Nothing wrong with your method, it's a G-mail security issue.
Login g-mail account settings.
Enable 2-step verification.
Use new-generated password in place of your real g-mail password.
Don't forget to clear cache.
php artisan config:cache.
php artisan config:clear.
MAIL_DRIVER=smtp
MAIL_HOST=mailtrap.io
MAIL_PORT=587
[email protected]
MAIL_PASSWORD=generatedAppPassword
MAIL_ENCRYPTION=tls