Even if Soundiiz is a powerful and complete tool, we are always recommending you to use transfer process made by music services if available.
If you are looking to move your datas from Google Play Music to YouTube Music, use the Google solution for that which support many more transfer options than us.
Google Tutorial is here => https://youtube.googleblog.com/2020/05/youtube-music-transfer-google-play-music-library.html
And you can start the transfer process here => https://music.youtube.com/transfer
Of course if you want to move from Google Play Music to another music provider than YouTube Music, you should still use Soundiiz for that. Be aware that while Google is not providing an official API for Google Play Music, using GPM on Soundiiz is requiring a Soundiiz Premium subscription.
And also, we are limited in features we can support for this service and will not be able to move your own uploaded tracks on GPM to another platform.