Milorganite is an old standby in this area, but it doesn't work that good.
A lot of people will also have blood meal added to their new bark. That's effective for a month or so.
You still have to switch things up often enough to keep them off balance.
I always try to find out what the golf courses are using since a lot of my clients properties are adjacent to or nearby one, then I use something different.
I think electric wire is a winner. I can't do that on my customers property, but I know a few would be delighted to watch the show.
Electric fence may work in your area, burt in our neck of the woods ... the deer just jump over it and enjoy a taste treat from the other side of the fence !