What about setting marketplace as a main business?

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Building relationships is central to business-to-business marketing. Businesses buy from people they like, not from the person with the cheapest product. Participate in organizations where your clients are active. Find people who can serve as referral sources for you and collaborate with them. A warm introduction is worth a thousand cold calls. Alternatively, you can visit https://www.codica.com/blog/how-to-build-online-marketplace/ to improve your results in the marketplace field.