A correct path around and away from your body combined with a square clubface at impact will stop that slice. The late great Harvey Penick said that once a student started hooking the golf ball, that was when they could really learn to play golf. I have a lack of distance off the tee, despite hitting the ball crisply. The ball flight laws that deal with distance are centerness of the hit and speed. Since you say you hit the ball crisply, then you need to concentrate on speed.
Speed comes from the momentum the club generates in the swing.
The farther the clubhead can travel, the more momentum it can generate. The measurement of momentum is called speed. Therefore, you can experiment with different ways to create more momentum. Equipment wise, experiment with longer drivers and different loft trying to find the right combination of carry and roll to help increase your total length off the tee. Once you have made the swing as wide as long as you can, then you can attempt to increase the rate or tempo that your body moves through the hitting area.