Im an investor who has founded several companies. If you really want in, figure out how to stalk the people you are interested in-really. Write your pitch and practice it over and over so its sharp and perfect. Do your homework, know what they need and why you can provide it. Then find them at their coffee hangout or where they surf. Be brave, and introduce yourself and give your pitch. Its a high risk strategy, but its a far better way to get to someone than chasing them on Linkedin or at a conference. Dont be creepy, and dont break any laws. And remember the sale is about them and their needs, not you. Good luck.