Spotizerr + navidrome + tempo

Spotizerr (fast development, sometimes breaks) will let you download you spotofy playlist. 320kbps too if you have premium. Also, deezer premium accounts are free for 1 month and let you download flac.

Navidrome replace Spotify as streaming server.

Tempo is a good android client. O also love symfonium but its not free (very worth paying for, though).