Describe yourself as a general manager rather than founder, owner or CEO. Talk about missing the collegiality and collaboration of working inside an organization. Talk about how you like to be able to brainstorm with colleagues and how much more can be accomplished by reaching a consensus. Mention that you’re eager to take advantage of the company’s resources so you can focus on the job at hand, whether it’s marketing or strategizing or analysis. Stress your interest in working as part of a team.
You can read more about making the transition away from self-employment in
6 Ways To Get A Job After You've Been Your Own Boss (Forbes)