Seasons of Jason@vancha You're right, you can export all your posts and uploaded media into an ActivityPub file format (not sure what to do with that, but I have it).
And it seems quite easy to at the very least retain your followers and the accounts you follow.
GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.
All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.