There are two ways to get rich with Steemit.

(1) Hard work. Write 4 original posts with compelling topics and information every 24 hours. For most people this means spending a few hours gathering information to write about and taking good photographs to go with your writing.

In addition to writing, you will need to comment thoughtfully on anywhere from 10 - 20 posts every day to build a quality following of people who will upvote your posts.

OR

(2) Invest about a million dollars in Steem Power and upvote all your own posts.

Needless to say, the better option is number one. It will take time to replace your "day job" so you'll have to start by building up Steem in your free time. The money is out there, but you have to work for it.