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I currently work as an SEO/SEO in training. Oftentimes I get projects that require me to look at well established websites of big brands, the kind one would assume put a lot of effort into their sites, and make SEO changes. Additionally they want "actionable" changes that can be made on the fly so content creation, and most linkbuilding, is usually out of the question. Does this limit me to just changing meta titles and descriptions? What if all that seems alright too?

So I work for a company that has a very successful affiliate that operates under a third level domain name such as "region.company.com". Their SEO practices are very good and they rank highly in keyword searches. However "company.com" does not even though it is not a subdomain. Even after optimizing the company.com's pages etc, the regional sub domain ranks much higher for keywords and the main company fails to rank at all. Is Google discounting the main company's page? Is it a matter of trust or time? or is it something else?

How can I get Google to prioritize the main company website rather than a lower level domain affiliate?