Fortnite tips against spray?

I like to play Fortnite and I'm superior to most opponents in close combat. But I do not know what to do if the opponent from middle distance with grenade launcher, rocket launcher, minigun etz. Just on it. I desperately build against it, try to possibly push against it, but the opponent shoots everything directly broken. What should I do there?

So I always build against it and move to the left, right or back.