To make sure it's not an equipment problem, get either a Nikon D810 or a Canon 5DIII, along with a couple of good lenses for either one. I use a 24-70L II on my Canon, not sure what would be equivalent for the Nikon. Remember, always think B I G !!!
The biggest advice I have ever gotten was from my college photo professor which was "Shoot an S ton and make friends and get drunk with them"