When you move from one Mastodon instance to another, though almost all of the work is manual, there is one nice thing you can do in the old profile.
Go into Edit Profile, scroll all the way to the bottom where it says "Move to a different account", and click "configure it here". Put in the new address, e.g. @firstname.lastname@example.org, and a nice message will appear at the top of your old profile referring everyone to your new home & hiding the old follow link. :)
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