You need to :
Do research on finding a suitable profitable niche that matches your personality or type of person. If you are a doctor and have knowledge on how to treat a certain disease condition perfectly. Then that is the right niche to focus on.its where you have your superpowers
You need to find location where your future clients often hang out...These days it is on social media most of the time and forums
You need to find out what your prospects really want.
You need to know how to produce what they want and then give it to them