If you want the latest cutting-edge version of MySQL you need to go direct to their Yum repository.
To migrate over, run the following:
rpm -ivh https://dev.mysql.com/get/mysql80-community-release-el8-1.noarch.rpm
yum module disable mysql
yum install mysql-community-server
Please note that the config is moved from /etc/my.cnf.d/*.cnf to /etc/my.cnf so make sure you move over any specific parameters