If you are looking for ideas to start a business, there are several things which you might want to consider. What type of work have you done over the years? Many entrepreneurs start businesses after many years of experience in a particular industry. They may enjoy the work, but may not be satisfied with their progress on the job or maybe they have been downsized from a job.
Personal interest and hobbies are a source of business ideas. Many business owners turned hobbies into a business, perhaps because they were not in the line of work which was satisfying to them. Some turned the hobbies into a business after considering all the people who came to them for help with their knowledge and expertise.
Still others, as in the case of Alexander Graham Bell and other famous inventors, made a discovery or invented a product which they could market.
If you are at a loss as to what product or service to market, you could brainstorm your ideas or conduct a search on the Internet to determine what the needs are for society.