Check them out and start submitting your music! I do not guarantee they will accept all your submissions. I also do not use all of them so I’m not familiar with all but it’s free.
1. Daily Playlists
2. Best Playlists Ever
https://thebestplaylistsever.com/
3. Virmedius
4. Never Enough Music
https://www.neverenoughmusic.com/
5. SoundPlate
https://soundplate.com/new-spotify-playlists/
6. INDIEMONO
7. Ditto
*Only submit ONCE per song, and ONE song per week
8. Xune Mag
9. The Music Below
10. The Static Dive
11. Chalkpit Records
https://www.chalkpitrecords.com/music-submissions
12. Spotify
*This submission platform is available through your Spotify For Artists page. Within the tab “Music” you will see the option of “Upcoming”. Here is where you will pitch your track to Spotify curators, but make sure you submit it with at least 2 weeks for proper consideration.
13. iMusician
*iMusic is also a distributor, but they have a super easy to use free playlist submission for artists who don’t use their distribution as well.