Can you move it to sun?

The vine will grow in shade, but your grapes won't be sweet.

You've got to change something. Growing one foot a year is like eating once a week. Just cutting it back, which is the right thing to do normally, won't improve growing conditions. It needs more sun, water, and/or nutrients.

the only place i can move it would be to a container for more sun. I has intended to use this as a fence and I will mix in a bunch of osmocote around the vine. it got plenty of water. Actually, come to think of it, it may have been accidentally mowed last year about a month or two into the growing season.