Just stop hitting the ball so dang hard. At some point, it's impossible to slice the ball. Find that. Then increase gently until the slice returns. You may have lost 50 yards off your drive, but that means you'll have 50 years less to walk into the woods.

Finding your non-slice velocity point (NVP) takes about two minutes to find. (We just made up that NVP thing so if you use it, please give us some credit)