Cant lose my playlists

I have 100 playlists for teaching yoga on my iPhone. All my music is stored on an external hard drive that I have connected to a Windows computer. I have been using iTunes since the first ipod. I understand iTunes is going to be eliminated. I do not want to pay a monthly subscription fee to access my own music. how can I replace iTunes? I need to create and manage my playlists and sync with my iphone 13. Thank you.