More people should use the SWOT analysis tool.
SWOT analysis is a way of noticing strenghts and weaknesses in a business. This can be used on your own business, but also when trying to find a niche to fill and make money from.
If you want to do this yourself, then do. But I would recommend for you to use the services of professional market researching firms. They can help you investigate a market segment, a certain segment in a certain geographical area etc.
Let’s say you want to see what kind of weaknesses that exists in the local food business segment in your local town. Then you contact the market researching firm and have them find the weaknesses that is currently existing.
When you know the actual weaknesses then you also know where you are the most needed. It is up to you now to find a solution to these current weaknesses and sell the idea locally to the businesses in the local food segment.
Now, test it. I am pretty certain you will make money from day one and if you are sharp, profit as well.

