Most guys in the gym—even the regulars—look about the same year after year. Maybe you do too, and that sucks. You don't go through life trying to stay where you are, so why are you still lifting the same weights as last year? Probably because you don't have a plan for progress.
Leading personal trainers suggest that in order to progress you design a program of workouts that will manipulate your muscles and ensure steady gains. Rather than changing completely different routines every month try making very subtle changes to the basic template, so you can stick with the very best exercises and rep ranges. This way, you won't lose progress on any lift while you still get enough variety to grow and keep it interesting.