People do business with people they like - so be likable.
If you're a fly fishing nut and know all the best spots to fish, you can find like-minded people to cohort with by joining a group or association that is passionate about fly fishing.
Or even better, you can start a weekenders fly fishing getaway for which you are the guide.
Successful businessmen like to fish and be outdoors, so it's a good group to affiliate with. They have the success, the business acumen, and the capital to risk to either back your company or become clients.