So you've reached side control -- great! Just don't make the same mistake of so many fighters who sit still in this advantageous position, without launching any sort of attack, waiting for the time to pass so they can win on points.
After stabilizing side control, strive for an even better position. Even if your opponent is closed up defensively, you can give them a little space in the form of a trap. In the moment your enemy turns their body to escape, you can dominate them from the back with the seat belt adjustments.
Check out Neiman Gracie's walkthrough of this progression.