It may be disappointing … but SEOs have no secrets as such.
SEOs do no have any tips and tricks other than those mentioned in the many websites and forums dedicated to SEO.
You have to know that your provider have no particular secrets nor connection with the search engines.
However, all SEOs are not the same. The SEO of a website needs an empirical experience and that experience is what will make the difference.
A good SEO is a SEO who has tested many methods, pushed the limits, seen what works and what does not work, what can penalize a website, etc. Moreover, a good SEO is known for their abilities to find good links to boost a website, or to establish efficient internal structures.