Migrate to Percona xtraDB cluster 8.0.19


as we have a new platform and we tried to use latest percona xtracluster DB 8.0.19 and currently we are running on Percona XtaDB cluster 5.7, what is the steps and all necessary concern on migrating data from 5.7 to 8.0.19 ?
this have to include user login name and password

You may want to check our Upgrade Guide

this is not an upgrade, we move data and all MysQL logic from 5.7.x to 8.0.19  in different machine. 

You can use Percona XtraBackup to backup your 5.7.X, restore to a new machine, install 8.0.19 and start MySQL. MySQL will automatically upgrade any system tables.