Design Suggestion for A Website

I’ve been working on a project similar to Scarlet iOS, and I’m looking for advice on improving the app’s visual hierarchy. One challenge I’m facing is maintaining a clean, minimal UI while ensuring that the core features (like importing files, app management, etc.) are easily accessible to users. How would you go about balancing functionality with a streamlined design? Are there specific design patterns or UI libraries you’d recommend for managing complex user flows without overwhelming users?