I didn’t create a clone of v4. I was only saying that if you continue to use v3, you might end up having to manage all upgrades and maintenance yourself once the support of it is abandoned.
But if you want to clone v4 (You can clone it via Github) into your own repo. You can still fetch updates from Strapi into your cloned version. (Cloning is not necessary except there are some core features you want to change).