I have a fixie bike, but i want to transform it into a road bike, i already removed the fixed sprocket and installed a single gear so that i can coast. But is it possible to install multiple gears on my bike providing it only had a cable slot for the rear break cable and had none for the derailleurs. And since it's a fixie it has a horizontal dropout frame, now can i install gears on my fixie bike?

Thank you.