Well, just the same again.

Hello, Fellas! I have used to be at appen, however my jobs are gone and now I don't know what to do. I have almost 400$ to receive soon. Someone of you guys know what should I do now? I have thinking about to write some ebook and sell through amazon, although I don't know even how to start.

There's a few things you could do. Do you have any talents? If so you could go freelancing until you've hustled enough.

Save that $400 and find a real job or work as freelancer to get some capital to invest in other IM projects.

There are number of methods and resources available here on BHW.
On top of that guidance and suggestions available from respected seniors whenever required.

One need to be fully dedicated , committed and focused.

Keep you spending to a minimum possible.
Most of the people fail and run into debt since they do not preserve what they already have.
Spend time reading and work on it by using all the free resources available
Once you find a method working for you and making some money for you then start spending to scale it up.

Wish you all the best!

"I have thinking about to write some ebook and sell through amazon, although I don't know even how to start."

Make sure you get a good proofreader and editor, as English isn't your native language.