the majority of the issues are repeating and can probably be addressed by fixing the root cause and not individually. Here is high level view of issues needed to be addressed:
images missing alt text
better line spacing in mega menu
link contrast
accordion issue
iframes missing title
Please give your fixed cost for this work, timeline, and start date. FYI – we are looking to start this ASAP as we have other clients who just gave approval to move forward with their own remediation work.