There are many ways you can make your chorus bigger than the other parts of the song. Generally it comes down to adding stuff that hasn't been there before. For example, opening up a low pass filter on a synth, which adds high frequencies in the chorus. Adding instruments. Layering a synth sound with one or two more synths. Or you leave the bass out of the verse and bring it in in the chorus, so you add low frequencies. With vocals (or other instruments) you can work with layering and panning. Let the voice be mono in the verse, for the chorus layer multiple vocal tracks and pan them left and right. Add reverb and/or delays. Add percussion or wooshes...
Like I said, it's all about adding elements that haven't been there and create a sense of denser and broader image. Broadening the frequency spectrum, the stereo image and the sound staging (how near or far away an instrument seems to be).