You can capitalize on your corporate achievements when marketing your freelance services by highlighting your transferable skills and experience. For example, if you have a background in corporate marketing, emphasize your expertise in developing marketing campaigns, conducting market research, and creating promotional materials. Tailor your messages to small businesses and startups, demonstrating how your corporate experience can benefit their operations. If possible, provide work samples, measurable results, and client testimonials from your corporate projects to demonstrate your abilities.