What actually moves the needle.
In rough order of return, based on what I have watched work rather than what makes a tidy framework.
Answer the questions people actually ask, in the form they ask them. Not "Our Solutions" but "how much should digital marketing cost." Self-contained, quotable, one question per section. This is why the answers page on this site exists in the shape it does.
Build corroboration you don't own. Podcasts, industry publications, conference listings, third-party write-ups, a Wikidata entry if you can support one. This is digital PR wearing a new hat, and it is the least glamorous and most durable work in the discipline.
Make your entity legible. Structured data that describes what is genuinely true on the page. Consistent naming across every platform. A clear, factual account of who you are, what you do, and who you do it for, expressed the same way everywhere.
Fix the plumbing. Crawlable HTML. Real text, not pictures of text. Clean, stable URLs. Fast pages. All the unglamorous things SEO has been telling you to do for two decades, which turn out to matter more now, not less.
Take positions. Engines cite sources that say something. If your content could have been written by any of your competitors, there is no reason for a machine to prefer you.