I honestly can't remember. There's some options listed here. I might have used Soundiiz? I seem to remember it was something I had to subscribe to, but only for a month just to get all my playlists and likes moved, and then once that was done, canceled the subscription. I remember there were a few cases where a song didn't convert because the name or specific mix or whatever was different, but I could just search it on YTM and add it.