I have had decoys cost me several shots at some huge bucks. No matter the setup it seems a truly mature buck will figure them out and not come into one. Not much luck there. What did help, was a deer attractant. You can read up on them on under-the-open-sky.com/best-deer-attractant
if you don't really know what it is. But just from the name of it, you should get the idea. It is a combination of nutrition designed to attract the deer from a long distance to your line of sight (for an easy close-up kill).