I'd recommend looking up how to prune the Holly trees, (or call in a Professional) and this coming spring, when you see growth on the Holly or other things around it, give it a fertilization with Miracid, which is from Miracle Grow, and has the acidity that Holly likes.
Ha...I think I have a bunch of that SOMEWHERE...Thanks
Now if I could find an easy way to kill poison oak... @1/2 acre of it!!!