Do investigation and talk to other businesspeople or ask for recommendations from the SEO companies you do consider.
SEO agencies work by using a large number of clients. Social networks and s change their policies frequently (neither you nor any SEO expert has control over this). https://h5spzr2va2tefnk6jfxd4tyqtg7zqhyskjdyhsli2yozkhs5ygzq.cdn.ampproject.org/c/www.barbecuejunction.com%2Fblog%2F118158%2Fbusiness-to-generate-leads-for-marketplace-agents-and-brokers%2F