Create content that is desired, relevant, updated, and to-the-point.
Google especially rewards content quality; if you fail at the above adjectives Google will flunk you quickly.
Part of accessibility is semantic structure. This structure helps search engines parse and understand page content.
Search engines give significant attention to titles and URLs. Also, title tags are the first thing people notice on search engine result pages.
Adjust content to address users' most frequently asked questions.
Tweak content wording to naturally contain the keywords visitors use.
It may take a month or two for Google to re-rank your page based on the changes you've made above.