In an article in The Regional Economist, Research Officer and Economist George-Levi Gayle and former Technical Research Associate Andrés Hincapié examined which is more effective for promoting economic mobility: policies that help the poor escape poverty or that limit the advantages of the privileged. They noted that the intergenerational persistence of income and wealth may help shed light on the answer.
One of the most appealing options, particularly for millennials, would be #12 on your list (create a Blog/Youtube channel). The videos can be about anything that interests you, from your daily makeup routine (with affiliate links to the products you use), recipes (what you eat each day) or as you mention, instructional videos (again with affiliate links to the products you use). Once you gain a large following and viewership, you can earn via Adsense on YouTube.

The organizing principle behind this grouping, appropriate economic units, is relatively simple: if the activities are located in the same geographic area; if the activities have similarities in the types of business; or if the activities are somehow interdependent, for instance, if they have the same customers, employees or use a single set of books for accounting.
If you want to add a little excitement to your passive income investing, meet Lending Club, the web-based peer-to-peer lending platform where investors looking for high-interest opportunities provide the funds for loans. You can earn interest rates in excess of 10 percent a year – about 10 times what you will earn on more conventional interest-bearing investments.
Successful YouTubers choose a theme for their channel—ranging from humorous commentary to gardening. As you acquire subscribers to your channel, your number of views becomes more consistent, which in turn grows your residual income. While you’ll need to produce regular videos to maintain your following, a couple hours of filming and editing pales in comparison to the revenue you can generate with minimum effort.
I prefer assets that make me a high return for the lowest amount of work possible (semi-passive involvement). And assets that pay me in several unique ways. Cash flow is only one way RE makes money for me. I also get principal reductions, appreciation, tax advantages (depreciation), and I control the rental increases on a yearly basis. Plus a majority of the capital is provided by the secondary market on 30 year fixed low interest rate debt.

A new venture was started under the wing of Pacific Life Insurance company last year called Swell Investing. They’ve created investment portfolios to cater to the values of certain people. These portfolios contain a number of stocks that fit the theme of the portfolio such as green tech or renewable energy. Dividends received are automatically reinvested to help compound your wealth for now.
Real estate is the obvious choice if you are going to make money on your money. I personally am not at the point where I can do any of this in a meaningful way BUT my parents are and they now own a couple homes outright and are collecting income from them to power their retirement income. It makes a lot more sense for anyone that has a chunk of cash sitting in the bank and are planning on slowly drawing from it because you technically still have all that money in a property (or multiple properties) and can sell them if you really need the lump sum of cash but you’ll earn great interest payments until you do that.