1. Get your Artist Profile verified
2. Get your fans to follow you on Spotify
3. Promote your music with Social Media
3. Be active on Spotify by uploading music consistently
4. Collaborate with others musicians
5. Promote your music with Spotify playlists
7. Promote your music with Spotify Ads
8. Promote your music with Facebook ads
BTW, Spotiy is built based on the cloud. Downloading music/offline music is just a supplement, an advanced feature, so it's paid. Remember that even if you download music to your device, you don't own it the same way you would if you bought it from iTunes. You just have the right to use it offline (and for a limited time). If you want to own the music, you may need Spotify music converter or paid for a Spotify Premium.