We have a software product for a specific industry and we want that to be visible on Google's first page. The domain we are using is almost 8-10 years old and once used to be on Google's 1st search result. We want it back, mostly we need to create quality backlinks with good articles/directory submission / PR, etc. It's a single-page website. Earlier it used to be HTML & then WordPress and now single-page HTML website.
Detailed requirements will be provided with the process and deliverables expected.