let me introduce the company to you so that you will know more about me Elon Musk If you believe you have a legitimate, innovative proposal in one of My fields of interest (AI, robotics, space tech, renewable energy), a formal approach might be possible, but direct investment in external companies is rare. 

He generally does not invest in ideas alone. You would need a working product and demonstrated traction.

The standard way to approach a high-profile investor involves networking and a formal pitch process, often through venture capital firms that already have connections or co-investors (such as Andreessen Horowitz, Founders Fund, or Google Ventures, which have invested in his companies).