If you are unable to find a promising niche from within your own interests and experience, which is quite likely, then you will need to spread your net a bit wider in order to find your niche market. Keep using Google, or another search engine as a reference and explore topics which you feel you could work with. It is rather important that you don’t come up with a highly promising niche but in a subject with which you feel no affinity whatsoever. If you are going to spend much of the rest of your working life working with that niche, it would be a shame if you came to hate your work.
Having found a topic which you feel happy to work with, the next step is to break that down into more specific areas of interest. If you have settled on the main subject of “Space Exploration”, for instance, there are so many aspects of that which could be exploited for business purposes. You could decide to focus on the history of space exploration; the Apollo Missions to the Moon; the future of space exploration; projected missions to Mars; NASA; Russian space activities; the European Space Agency; etc. etc. These are all viable options with plenty of interest and, no doubt, a large marketplace.
Make a list of as many sub-topics as you can think of. Then it’s back to the internet research, doing more research in cyberspace. (I couldn’t resist that). If you find one area which looks promising, break that down into even smaller areas of special interest. You can see now how the process works. Begin from a major topic where there is a huge following and gradually work inwards until you find an area of interest which still has plenty of followers but which gives you a chance to make your presence known. I just put “Space Exploration” into Google. This is, as you would expect, far too big a topic to work with, giving a result of 10,400,000 websites on the subject. I tried “European Space Agency Missions” next which gave me just 3,400 websites, which is a bit too low a figure for our needs. Most advice recommends the ideal number to be somewhere within the range of 20,000 to 30,000 websites. This shows that there is a good marketplace of eager customers but one within which we can operate successfully.
To arrive at your ideal category needs a little more research using keyword tools to really home in on the perfect business niche. Once you have your niche and your hot marketplace you can then begin to develop your business, sourcing products and deciding on your marketing plan. As with every aspect of internet marketing research is the key if you want to find your niche market.