The main principle you should build your design around sounds like “put the user first.” UI/UX design is customer-centered, meaning you need to consider whether your design satisfies customers’ needs and helps users achieve their goals. It’s crucial to walk in customers’ shoes and understand what they’re looking for when interacting with your app.
A UX designer and a design director of Mailprotector Jeremy Nigh said that the “U” in UX doesn’t mean “You” but “User”. Whatever excellent you think your design is, the actual customers may feel the opposite. Try looking impartially and reveal through UX research what your customers really need.