First off, I hope this isn’t overwhelming. 😅 Don’t feel any obligation to make any of these changes if you don’t want to, these are just suggestions. I’ve tried to provide explanations for each change, so hopefully you can understand why I’m suggesting it and apply it to the rest of your site, if you so choose. If anything’s unclear, don’t hesitate to ask.
I’ve made a number of changes to fix some malformed HTML and improve the semantics of the markup, which will help assistive technology parse your site. I made notes of all of the changes along with some recommendations for additions to your CSS.