Minimalist Web App UI Refresh

I have a fully-functional web application with roughly fifteen separate pages. While everything works, the interface feels dated and a little cluttered. I want to keep the core layout structure and our... (Budget: ₹1500 - ₹12500 INR, Jobs: Adobe XD, Figma, Graphic Design, Logo Design, UI / User Interface, User Interface / IA, Web Design, Website Design)