Will the one who published songs bear the sins of those who listen to them after his repentance and his attempt to delete them, but he was unable to delete all of them due to forgetting account information, knowing that he was unaware of bearing the sin at the time of publishing?

As long as you have sincerely repented to Allah for your sin, then repentance erases the effect of the sin and makes you like one who has not sinned, according to the Prophet, peace and blessings be upon him: "The one who repents from a sin is like one who has no sin." Whatever you were unable to delete from the songs will not harm you after repentance, and you will not bear the sin of those who listened to it.