If you haven't checked them out yet, the accessibility tools in Google Chrome's Lighthouse[1] audits were absurdly helpful to me when I had to do an accessibility audit on a recent marketing site. They're not totally exhaustive, but it's certainly a fantastic start and would have at least helped you catch low hanging fruit like contrast.

[1]: https://developers.google.com/web/tools/lighthouse

Major ones I would fix are:

- your 404 page is returning a 200 status code instead of 404 (making it hard for Google to know what's a broken page)

- your server isn't compressing (i.e. gzip) any of the responses which will impact speed a lot.

- you have several broken external links e.g. one to chandlerdpethpsych.com

I used this Chrome extension (I'm the author) to crawl and find these issues if you want to check and confirm fixes:

https://www.checkbot.io

This is kind of a nit-pick, but aside from what others have mentioned, your font for large and bold text (e.g. "As a woman over fifty...") is hard to read (and my vision is good). I'd suggest something clean, straight, sans-serif, and easily recognizable. Helvetica is probably a safe bet, though I'm certainly not a designer and am approaching more from a standpoint of legibility than usability.