This import tool (skeet.labnotes.org) works well. I just used it to follow my alt-site users on Bluesky. (To use it, you will need to create an App Password in Bluesky settings, which is not explained very clearly)

PFfarhana.bsky.socialAug 23, 2023 12:23am

New folks: Great tool to import your follows from Twitter and Mastodon to BlueSky! skeet.labnotes.org

Skeet @ labnotes.org

Find your Twitter/Mastodon follows on BlueSky