Hello my friend, there are many training methods that increase yield. The easiest and most famous is to top the plant when it has reached 6 nodes. Also get rid of the lowest node so now you got node 2,3,4,5 left. Then use LST to let them grow on the same level so they gain the same amount of light from the plant and all become main buds.
Then do not overfeed, mostly a EC from 1.5 is more then enough. Keep the pH within the right range around pH 6.2 for soil. Do not overwater, never give water till the top inch of the soil is completely dry before you water again. And provide the plant with as much light as you can! Light is weight my friend!