If you're not trying to time a light, then the best thing to do is to hold your foot several inches above the accelerator, and then try to kick it to the floor. This will allow you to press it down quicker than starting with your foot on the accelerator.
There's no need for the driver to attempt to avoid wheelspin in a Tesla. The traction control system in a Tesla is a thousand times more responsive than in any other car. Watch all of the races in the Model 3 drag races thread. About half the time when it's racing a fast car (like a Hellcat), the ICE driver will screw up the launch and just smoke their tires. You'll notice that the Model 3 _never_ has a bad launch. I've floored my Performance on a wet road. It didn't launch as hard as it normally does, but there was no wheelslip at all.
If you really want to improve your performance beyond the obvious (stickiest tires you can get, hot fully charged pack, etc), you could always start stripping the car down. 0-60 is about power vs. weight. Cutting weight leads to a linear decrease in 0-60 times. Every ~60kg cuts about 0,1 second off your time.
It's either that, or add more power. Unless you're thinking about adding packs / motors, that would require tricking or modifying the software to go beyond what track mode lets you, in terms of risking damage to your car in order to eke out max performance. You'll want to talk with a teardown expert like Ingineerix about that, if that's your goal.
Of course, I assume the answer you want is simply, "Yes, just floor it". The car takes care of maximizing grip.
ED: there's always a trick you can use to accelerate even faster: instead of launching horizontally, try launching vertically downward. Say, from a crane.