Accessibility audits for websites and applications, with prioritised fixes your team can actually ship.
Accessibility is a legal exposure in Australia under the Disability Discrimination Act, and it is a commercial one: government and enterprise procurement increasingly asks for a WCAG conformance statement before they will sign.
It also overlaps heavily with quality. Most of what makes a site usable with a keyboard or a screen reader also makes it faster, more crawlable and easier to test.