Before answering your question, it is important to know your business status - stage of business cycle, facing any crisis, financial position, quality of your solutions to customers, etc.
With better understanding of your business, we can answer your question with a solution. Otherwise, the answer to your question will be a long list of "how to" and you may get a better answer by searching Google.
Whenever we look at which market to target, there will be many testing, guessing, solution adjusting to achieve product-market fit. If you solely focus on segmenting the market and adopt some marketing techniques to increase prospects’ attention or leads, you will still get no way as product-market fit cannot be achieved.
Hope the above can help you to relook at your question and prorise your requirements.