Follow the steps bellow to fix problem connecting MySQL 8 using a database client i.e Sequel Pro
brew update
brew install mysql
brew services start mysql
Add default-authentication-plugin=mysql_native_password
to my.cnf file. This config file can be found in the location /usr/local/etc/my.cnf
mysql -uroot
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '[password]';