I would draw furries.

Don't get me wrong, I would not enjoy it. But at this point I'm dependant on the cashflow, and that's the only other thing I know that pays well...

What are your different sources of passive income (if any)?

[Background]
Back in September I joined a startup after my first job in MNC for about 1.8 yrs as a fresher. I always wanted to learn, but the experience in that MNC was not at all fruitful. So ai decided to join a small/mid size company or a startup. To my luck, I got in this small startup in a week after my resignation as a front-end dev (always wanted to be).
It's an automation company, so you can find software, electronics, even mechanical engineer.
The team was almost a year younger than me. It was a team of around 12 people, in which 5 of them were from Business development.

The tech team was too driven and knowledgeable. Always trying new stuffs and motivating to do the same. I was highly motivated by them in my initial days, watching them working on new stuffs.

So I started with revamping their website completely in Angular 4, and did it in around a month or so, being new to Angular. Outcome was pretty satisfactory. I wanted to work on new projects, but just to get the cashflow in they started getting in WordPress projects. It was frustrating, I wanted to work more on new technologies like Angular, React, etc...but just for the survival of the company I had to work on WordPress, so to respect their urge to get going I kept working on 3-4 projects in parallel, and mind you the clients were from hell !!

Fast-forward 4 months, I am still working on few WordPress websites, and one internal GPS based project in React. And I haven't received my salary for past 3.5 months, since the company is still struggling with the issue of funding and getting money from clients. I kinda liked working there because there was lot to learn even though they are so young, but I had bills to pay too.

And I am in dilemma to leave the company or not, because I already stretched 3 months out of good will and guilt of leaving the company in high time. So i finally let the CEO know that I cannot stick for any longer. And i was done with the false promises of getting the salary "next month" everytime. All the money getting inside of company was invested heavily on the product we were building and no one was getting the salaries. Others were fine since they were founding members too.

Long story short : I finally left immediately and now working in a good company as a React dev. I hope they do well and I would love to see them grow, but please *STOP* making false promises and hold on to employees on a lie.