A site audit is a complete analysis of every single factor that determines your website’s visibility in search engines. It’s basically when you engage the services of a professional to examine your website with tools thus giving you a better idea of where you have problems that need fixing. In other words, a detailed website audit will give you a better understanding as to why your website is not performing the way it should. For the most part, a normal website should serve its purpose of attracting visitors, keeping them hooked and hopefully convert them into paying customers.
Checking if your site is indexed properly is essential. You can do this inside Search Console. You need to make sure that all your pages are crawled and indexed and that you don't have any 404 errors or other page indexing issues - which includes the AMP (Accelerated Mobile Page) indexing issues - should you already have submitted your AMP powered site for the mobile index.
Yes solid keyword data dramatically changes the game as far as rankings go. I have seen many tools that provide Cost per click stats and meaningless charts that confuse most users. the data Jaaxy provides helps drive “organic” traffic to your site on a consistent basis which will out perform PPC sites every time. I like how you say thinking like the end user, as I feel that way when I search. I dive into what people are looking for and it really helps drive content idea’s. I have seen great results from that.