Its not rocket science.
Start interacting with others by listening to their music and leaving genuine comments.
You'd be surprised how far this will get you..
#TriednTrue
Ps:
Don't leave comments that say "Hey this song is sick check out my beat here: http://my-link-because-this-comment-was-not-a-comment-but-more-of-an-advertisement-for-my-music."
Because that sh*ts lame...
make good beats and get good rappers to rap on em !