Long road to less

Later this week will be the fourth anniversary of my weight loss program. For the last year I've been hovering a pound or two above my original goal of 180 lbs. After my first year I was down to less than 175 lbs which I held around for about two years before the upward creep. I would like to get back to that range, need to get re-serious to do it. My exercising over for almost two years now has increased substantially but it alone hasn't been enough to return me to my former glory.