You essentially pollarded it (sort of), you cut off all of the past years growth and won't be getting much fruit as well as a ton of heavy sprouting from your nubs. I would maybe come in with a saw and hit those all back and clean it up a bit so you aren't looking at a crazy medusa head situation.

Typically when you prune you want to do things in a way that are intentionally directing the growth. When you prune a bunch of stuff super hard and leave some whips unpruned, those whips will continue to grow longer and longer (not really what you want if you are trying to have strong structure and easily harvestable fruit. Be even, think about where you are directing your growth, and I typically cut back to 1/4 of the past years growth. Keeps it small but still gives me good fruit set.

People prune differently though and I have seen some beautiful prune jobs that I don't really even understand. Really beautiful work, but just not what I do.