I've done a few small-scale businesses over the years, some failed, a few succeeded. One lessons I've learnt from these ventures is to focus on the value you will provide to your customers, don't focus on the revenue the said business will generate. Once you do this everything changes.

Next is to do proper research of any business you want to embark in. To know the challenges those in the business face, possible setbacks, the best location to establish the business where it's guaranteed to be patronized, what advertising method would work best for the business, etc. When in doubt ask those who are already successfully engaged in said business.

If there's something of value you are sure people would be glad to get from you, and would pay to get it, like a piece of knowledge, a skill, a service, a product, then you have a business opportunity. Focus on making them benefit maximally from that valuable thing you have, the revenue aspect will take care of itself.

I wish you success on your next business venture. Many successful entrepreneurs today, some of them billionaires, had failed business ventures before they succeeded. Don't be discouraged, learn from each experience, never repeat the same mistakes, and keep pushing.