If you’re younger, try robotics.
#9 Youtuber Make millions unboxing products then reviewing them. http://www.theverge.com/2016/12/22/14031288/ryan-toys-review-biggest-youngest-youtube-star-millions
Another http://fusion.net/story/38924/the-highest-youtube-earner-of-2014-made-4-9-million-just-by-opening-disney-toy-packages/