Using Data API v3, you can get a list of all playlists associated with your channel. 'https://developers.google.com/youtube/v3/docs/channels#properties' -> 'contentDetails.relatedPlaylists'
Iterating through these playlists, you can get video ids and feed them. 'https://developers.google.com/youtube/v3/docs/playlistItems#resource' -> 'contentDetails.videoId'
Or you can put the whole playlist as a player by,
going to playlists -> 'player.embedHtml'