Reduce it to one slide.
Or at least, 1+1 slides.
Slide 1: Your tagline — a 1 sentence summary.
Slide 2: 8–10 points summarizing the investment opportunity. Who, What, Where, Why and How.
If you can get it down to 1 main slide + a 1 sentence summary slide … the pitch usually is 95% better.
Anything longer than that is a ramble. Everyone starts to lose interest as you ramble.
Once you have the pitch reduced to 1+1 slides … then add slides 3–30.