I can give you hundreds of ideas right away if you want to start a side business to generate a passive online income. However, you have to work hard to implement the money-generating business.
You can start while working at your full-time job. When you start making some money from your online work, you can quit your job.
When I started my online business two years ago, I was afraid of sharing my ideas with people. However, I realised that I was wrong because I can only work on two or three ideas at a time. So I decided to share all my research and ideas with you.