Hi,
I have published a how-to tutorial which would guide in migrating existing WordPress site to EE v4. It is a humble attempt to help non-developers and people how are not familiar with docker containers to test EE v4 with their existing WP sites.
Note: I do not intent to suggest existing EE users to migrate to EE v4 as EE v4 is in beta currently. Also, WP site migration is at your sole risk and I will not be responsible for any loss or damage in any way what so ever.