So our store had like 680+ wcag violations and most of them were baked right into the theme itself, the problem with shopify themes is you can't just refactor everything because if you break one liquid tag the whole checkout dies, plus we had all these customizations making it even messier. Color contrast alone was probably 200 violations, I had to use this contrast checker and manually fix all the button colors and text overlays, which is as tedious as it sounds Istg, Aria labels and alt text took forever, every product image and icon needed proper labeling, keyboard navigation was definitely the hardest part though, shopify's default cart drawer doesn't trap focus properly so I had to basically rebuild it from scratch, same with the mobile menu. I tested everything with actual screen readers like nvda and voiceover which caught stuff the automated scanners totally missed. Forms that looked fine were completely broken for blind users. Eventually I just automated most of it because I was genuinely losing my mind, the whole process took about 100 hours. Documentation is super key though, you need to track every change so you can retrace steps if something breaks.