Hey, sorry for the trouble! Looks like fetching one of your blobs from Bluesky failed, and we don't currently retry as well as we should. I've filed https://github.com/snarfed/bounce/issues/67 for that.
In the meantime, I've reset your migration. If you log out of your Bluesky account in Bounce, and then log back in and try again, it should hopefully get farther this time!
@snarfed.org Thanks I will try!