Is there any way to be a better tactic player?

Hello,

My battle horse has always been tactics. I have never got to be a great tactic guy. I tried doing tactical exercises for long though perhaps without due diligence and perseverance. I would like to hear the testimonies of people here that _really_! improved tactically to reach beyond to raise its level above 2000 elo points, an increase of more than 100 points (not being young but > 30). Is it really possible to improve tactically consistenly? What is the method you have used? And what have been the books that have encouraged you and helped you to get that increase in tactical ability? (or on the contrarie is it very difficult to improve?)

thanks

One puzzle a day keeps the blunder away