By now you should have a short-list of investors that you want to partner with and some proof points that you're working towards in your current milestone.

If you have someone who can make introductions, you should contact them with a short 1-2 sentence description of your business and ask if they can make an intro. If you don't have someone who can introduce you, contact them directly.

The goal for this task is to make them aware of your company or product, not to "pitch them".