The Yoast SEO plugin is currently active on over 5 million sites, which means that its features are also limited by the most common and basic needs of those 5 million site owners — content creators and SEO experts often require more control and fine-tuning than Yoast SEO can deliver.
Before considering any Yoast SEO alternative or enhancement plugins, we should clarify what Search Engine Optimization (SEO) is, how a plugin like Yoast SEO helps, and how an alternative plugin like WPSSO Core and its add-ons differ from Yoast SEO.