Structure first, skin later
A redesign usually changes CSS and components — not the meaning of the page. If your markup already exposes nav, main, article, and labeled forms, the rebuild stays cheaper and more accessible.
Prefer one h1 per view, sequential heading levels, and lists for lists. Screen readers and SEO both reward this discipline.
Forms without mystery
Every input needs a visible label (or an aria-label when the design truly cannot show one). Error text should be associated with the field, not dumped at the top of the page alone.
Use the correct type and autocomplete attributes. Browsers help users fill passwords, emails, and addresses when you let them.
Checklist before you ship
Can you navigate the page with keyboard only? Do images have meaningful alt (or empty alt if decorative)? Are interactive elements real buttons and links — not divs with click handlers?
If you answer no, fix semantics before adding another animation library.