Earn by domain/website flipping.

Website Flipping refers to creating or buying a website and then fixing it up and selling it to make some
money. There are a lot of factors that will at what price you can sell your domain such the time spent on
developing, optimizing, and getting traffic to your website. You can sell a website from 10$ to 1,000000 $, it
all depends on the website’s traffic and overall worth.

I suggest you to look into most expensive domain names, and it will give you an idea on how much money
you can easily make by just selling exclusive domain names.  Here is a list of Websites which you can use
to sell websites and out of them, my personal favorite is Flippa.