The best alternatives to Diffuse are Spotify, Timber, and AutoBeat Player. If these 3 options don't work for you, we've listed a few more alternatives below.
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Blaze— Create beautiful 1-click content in your brand style with AI
Moosync is a customizable desktop music player with a clean interface. Listen to music from your favorite service (Spotify, Youtube, or self-hosted Subsonic, Plex, Emby instances) inside one app. Available on Linux, Windows and MacOS.
SongBox Player is an MP3 player for your Dropbox - Organize your music on Dropbox by Song, Artist, Albums, Genre, and more - Download tracks for offline playback - Create your own playlists - SongBox automatically discovers song metadata