As a simple example, I recently renovated a Victorian-era house in the UK, and throughout the process, I was looking for various professionals that could demonstrate relevant experience. In this case, having a well-optimized case study showing renovation work on a similar house in the local area would serve as great long-tail SEO content — it also perfectly demonstrates that the contractor can do the job, which perfectly illustrates their credibility. Win-win.
Regarding internal linking, i believe that in the case of two links pointing to an internal page, being one of those links in the group i mentioned above, they will considered only the one witch feed the algorithm with more information. In sites that have the menu before the content, it will be the second link. I think that’s the smart way for them to analyse all the links to better understand the destination page content. And they are smart 😉 .
Lastly, it's important to remember that paralysis by over-thinking is a real issue some struggle with. There's no pill for it (yet). Predicting perfection is a fool's errand. Get as close as you can within a reasonable timeframe, and prepare for future iteration. If you're traveling through your plan and determine a soft spot at any time, simply pivot. It's many hours of upfront work to get your strategy built, but it's not too hard to tweak as you go.