The challenge I’m facing and, I know it’s a good problem, is that the SF real estate has shot up about 35% in the last couple years. I’m sure you’re experiencing the same thing! So as the net worth is rising, the yield on the total portfolio is going down. Right now, it seems the only way to increase the passive income will be to raise the rent in December and to invest some of that cash in stocks, which I’m nervous to do in this market. Current allocation:
Ever find yourself humming a tune, or laying down tracks for yourself or friends? Your next catchy phrase might fetch you a solid passive income stream. On sites like ProductionTrax and Audio Network, musicians can license their compositions for background music in apps, commercials, and websites to earn more money. Read more about this strategy at The Guardian.
You may not have all the expenses listed below, for example if the tenant pays utilities or if you manage the property yourself. This is just a list of common expenses. It is extremely important that you build out an estimate on your own before you purchase a property. Most of the information can be gotten by calling around or researching expenses in the area.

That’s why I sometimes hesitate to even say I participate in affiliate marketing. But that’s not how I, or you, should approach it. I’m here to lead the change and show people there is so much opportunity out there in affiliate marketing the right way (and the smart way). It’s insane to me that more people aren’t really realizing their full potential with this.
Also, if you pursue an income stream like affiliate marketing, your blog can be a source of content that allows you to link to affiliate sites in a way that is seamless and natural. For example, if you are an affiliate marketer for a company that sells productivity tools, you can blog about your own struggles to stay on top of your to do list. Then, you can mention how much those tools have helped you. 

Investing in coins and collectibles: Buffalo nickels and Spiderman comic books are good examples of coins and collectibles that can rise in value, and thus offer opportunity for passive income investors. You'll need to get up to speed on the value of any coin or collectible under consideration, but once you do so, you're on the way to price appreciation on a commodity you'll be paying a lower price to buy, and will garner a higher price when you sell.

I think you should use Financial Samurai to raise your passive income. You’ve already proven that you writing 3 articles a week is enough to not only sustain the site but grow it. Why not have more guest writers post articles? Since you started with the extra post each week I’m guessing traffic is above your normal growth rate. Leverage that up with more posts and my bet traffic will continue to grow.
​If you pay your bills with a credit card make sure it offers cash back rewards. You can let your rewards accrue for a while and possibly put the easy money you earned toward another passive income venture! (Be sure that the card you select doesn’t have an annual fee or you might be cancelling out your rewards). Check out this list of the best Cashback Rewards Cards.
But, you don't need to go further than that. You can simply write it and publish it and collect the income. That's all. Send out a couple emails to your list (if you have one) or post it on social media, and there you have it. Passive income. Now, the amount of income you receive depends on the quality of the book you've written. How well did you craft the message? How targeted was the information to your audience? It counts.
While having multiple streams of income is ideal, you need to choose the right one for you. For example, if you want to earn money from a blog, you need to pay for web hosting, choose the right niche, design your website (or have someone design it for you), create a blogging schedule, share your posts, develop a community, guest blog, and choose the best affiliates for your blog niche. Blogging is work, but it is fun!
Let’s continue the vintage BMW idea. Old cars obviously require quite a lot of maintenance. Many people will buy a “fixer upper” with the intention of spending their spare time repairing and restoring it. There’s a very obvious market here: a guide to restoring different BMW models. Depending on your knowledge, you could produce detailed guides for the three or four most popular models and sell them. Not everyone restoring a car will buy them, but some probably will.