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.
I’ve tried a fair few things on this list and I’m a big fan of those side hustles that have the potential for ongoing passive income once you’re set up. For me, the most successful have been blogging and T shirt designs (I use Merch by Amazon but want to look into Teespring as you suggest). I’m currently working on an Etsy printable business, again for the passive income potential!
4. Immense choices - As mentioned before, there would be immense open doors at your doorstep. You can do whatever you need. You don't have to be an Ace in a particular field however you can be a Specialist in a specific field which you jump at the chance to do the most. In case you're great in keeping in touch with, you could make a digital book and offer it on the web, or begin a blog on a particular specialty or in the event that you are great in coding, you can outline site layouts and offer it online simply like consultants do.
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I’m really torn here. As a writer, I sympathize with you. I’ve looked again and again into freelancing, and consistently find that the rates other people are willing to work for make it an insulting waste of my time. (Like, $10/hour is what a 15-year-old babysitter makes, not a professional writer.) On the other hand, you really can’t ask others to not compete with you. On the plus side, in my (limited) experience, you do get what you pay for most of the time. My sister had a less-expensive wedding photographer, and she was definitely less than happy with the results. So …
Before you really roll up your sleeves and monetize your personal or professional skills, why not right-size your life? Selling your unwanted stuff is a great way to downsize and declutter your life while earning some income on the side. If you’re transitioning to full-time work-at-home status, that income could provide a critical boost to your plans for a proper home office, or allow you to maintain your lifestyle during lean times without resorting to voluntary simplicity.