Submitting things in bulk is a huge time saver.
Case in point: the reason why you want more followers on Twitter, Facebook, or SoundCloud is so there are more people to broadcast your music too.
Look at submitting music through these services like you would a re-post on SoundCloud. It helps hasten the exposure process.
Also, when you submit to labels try and come up with a unique pitch. THINK like they think. Labels want really good artists in their repertoire, but they also have to make money to stay afloat.
If you can show them you're already making money and have a solid fan base, they're more likely to respond to you.
If you're struggling earning income from your music, click here to get some marketing resources to help.