Donating plasma can actually work out better than selling your blood.  It takes longer to donate plasma because they will put your red blood cells back in your system. The upside is that you can donate plasma as much as twice a week and you can make anywhere from $40-$60 per donation. You can make that $100 in less than a week if you can stomach the needle.
Considering that you have a finite amount of time, passive income should make up a large part of your work. If you're serious about generating any semblance of income online, then passive income should be one of your sole goals and ambitions. Why? Wouldn't you prefer to do the work one time and get paid repeatedly as opposed to relying on your time to generate that income? Invest the time at the front-end so that you can reap the benefits on the back-end. This means putting in a bit of sweat equity and not getting paid today. Rather, you'll get paid somewhere down the road. And you'll continue getting paid whether you keep building that passive income stream or you stop. 
Making some extra side hustle cash doesn't actually have to be that complicated. As someone who's been immersed in the field of online income generation for nearly two decades now, I can tell you that it takes some work. However, there are several clear paths forward. At the end of the day, it all boils down to what your goals are and just how much you're looking to automate your income.

Krystal, I understand what you are saying, but I have made money selling pictures online, and I am no pro. I can get great pictures of wildlife, tropical landscapes, and many things that other photographers may not be able to get. Should I not do this, so that other photographers can? I am also trying to pay bills and run a household. It seems that raising prices could eliminate some of your future clients. I occasionally get calls because someone can’t or won’t pay $250-$500 for someone to take pictures of their family on the beach. I also give them the CD of all of their photo’s, which many photographers won’t do.
The main barrier to entry is having an approved car that is efficient to keep your costs down. But there are lots of stories of Lyft drivers making an extra $1k a week outside of their normal day jobs! Not bad. Plus, this is a fun way to get to know your city, help tourists make plans, and get to know interesting people. Lyft is offering $300 Sign-up Bonus!

I think what you’re asking is how you can make extra money to pay your real estate taxes. If that’s the case, it depends on your current financial situation, the amount of your estate taxes, your skills, and more. If you visit the “Make Money” section of our website, we have a few articles with different ideas that may be helpful for your situation: https://www.dollarsprout.com/category/make-money/
You can potentially make even more money by offering to handle snow removal in the winter. Shoveling snow is often a homeowner’s least favorite job, and there are many homeowners who simply cannot handle their own shoveling because of physical limitations. Typically, snow removal companies charge a flat fee for the winter, no matter how many times it snows.
“Donating plasma is similar to giving blood. A trained staff member called a phlebotomist puts a sterile needle in your arm vein to draw blood. The blood is then cycled through special, sterile equipment that separates plasma from the other parts of your blood. Your plasma is then collected in a container, while the other parts are safely returned to your body. This process is called plasmapheresis.”
If you have a vehicle that just sits in your garage for long stretches of time, you might find a car rental service like Turo is one of the easiest ways to make extra money. Let’s say you list your 2014 Nissan Maxima in Denver, Colorado. If you rent out your car for just 10 days a month, Turo says you could make around $365. That’s more than $4,300 a year!6
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