If you have more time then you can add further income in your pocket by working as a captcha solver. This is the one of easiest way to earn money online.
As a captcha solver, you need to read the captcha images & type the exact characters. You need to be very fast in order to earn better income.
You can get paid up to $2 for every 1000 captchas you solve
Perhaps the most popular way to earn a passive income is by launching your own blog. It only takes a couple of minutes to set up and is cheap to start - just purchase your domain name and pay for hosting.
After that, start creating amazing content that people would be interested in reading or sharing. For example, if you’re an accountant that has helped small business owners with their taxes, then that could be your blog. I personally have my invoicing blog to help customers know everything there is to know about invoicing. This draws thousands of signups a month.
Make sure the topics you write about are popular. If you still love your pet rock, I doubt there would be enough people visiting your our site to monetize it. But, you never know.