Since I am a blogger and I sometimes need a service where would provide quality services to Convert YouTube, TikTok, Facebook, Instagram, X (Twitter), Soundcloud & VK, Rutube to MP3 then I can now safely tell you that it makes the best sense to go to this site - https://fmp3.cc/ ! This is exactly what I've been looking for for so long.
Basically, this can be done through paid applications. There are many of them. And the prices for each such application are different.
You just need to choose the functionality that is most convenient for you to work with.
I think it's quite possible to figure this out. I somehow figured out this playlist https://gyre.pro/blog/how-to-create-a-playlist-on-your-youtube-channel thanks to this article. Search the Internet. You will probably find useful information on this topic there.