Revamp Luxury Watch Next.js Site

My Next.js-based website for a high-end watch brand needs a thoughtful tune-up. I want three things tackled at once: the design/UI needs a fresher, more contemporary layout; load times and Lighthouse scores... (Budget: $30 - $250 USD, Jobs: CSS, GraphQL, HTML, JavaScript, Next.js, UI / User Interface, Web Design, Website Design)