Legacy Windows iTunes password missing

I recently upgraded to an iPhone 16. About 90% of the music is no longer available to me. All this music looks to be my original iTunes library from 2005 created on a windows machine. My email at the time was a compuserve account, for which I apparently cannot remember the pw. Resetting the pw does not work as “cs.com” no longer exists. Is there a workaround for this? Please!! 🙏🏼 Thanks! 🙏🏼 🙏🏼