Ask HN: If you had to make $5M in 10 years, how would you do it?

This question is an extension of one posted on reddit[0], which was featured on the I Will Teach You To Be Rich[1] website.

How would you do it?

[0] https://www.reddit.com/r/AskMen/comments/41wvul/if_you_had_to_make_a_lot_of_money_say_5000000/

[1] http://www.iwillteachyoutoberich.com/blog/fascinating-question-about-making-5-million-in-10-years/