Getting back my explosevness

[Teh1337zor]

First just to give you an idea for my body type im 6'2 and around 205.

In highschool I felt like I was a pretty good athlete playing varsity basketball and football for 3 years (starting 2 and 1 respectively). 2 years removed I still play basketball with my friends but its much more competitive than a pickup game bc all of us played at a pretty competitive level earlier in our lives. When in highschool I had a great first step and good jumping ability. I used to be able to dunk with relative ease and make breaks on balls with no problem. Now, I feel like I have lost my step I can no longer speed up and slow down as fast and cant dunk unless no ones within 15 feet of me and I have a running start. How do I regain the explosiveness I once had? Are there any drills you guys recommend?