@echosa Unfortunately, the GNU social database has fully-qualified URLs for your current users. While there are scripts to fix up *your* DB to make it portable, those same URLs also exist in every other DB in the Fediverse. There's no practical way to get every other instance to update their DBs for the users in your instance. So the best way is for each of your users to send a message to all their subscribers to inform them of their new location. Welcome to the era of steam-powered social federation!