There are quite a few playlists on Spotify that you can get on if you know who to ask. It is likely that your favorite playlists will accept submissions! Here are some other good places to send your music.
Soundplate is a great option because it aims for diversity in the genres that it features.
Spingrey is another great option that accepts a variety of music styles.
Check around to see what playlists you may fit in and send them your music. Popular playlists are always looking for good music to share with their listeners.