Here’s how to migrate your followers from your WordPress.com site to a self-hosted site.
First, you need to have Jetpack installed in your self-hosted site and connect it to your WordPress.com account.
Go to https://wordpress.com/sites to view all your sites.
Find the site you want to migrate your followers to then click the Gear icon (on the upper right side of the box) then click “Select this site” on the drop-down menu.
On the left menu, click Settings.
It will come up with a screen that says “Jetpack Monitor” and “Move Followers from a WordPress Site”.
Under “Select WordPress.com Site”, select the site you want to migrate your followers from, then click the button “Migrate”.