What is the ruling on publishing old clips, pictures, and music after repentance and deleting the account? Is repentance accepted if others repost them? And does the publisher bear their sins?

As long as you have repented with sincere repentance, then your repentance is sound and accepted, and the persistence of the sin's trace does not harm you. Take it easy on yourself and do not preoccupy yourself with this matter. Strive in obedience and multiply supererogatory acts of worship, for indeed, good deeds efface evil deeds.