You should consider a design system for your app. Implementing a design system demonstrates your knowledge of Human Computer Interaction (HCI). A design system is made of three things:
Apple and Google both use design systems. Apple's is/was called Cupertino (now I think they call it UIkit), while Google's is/was called Material Design. These systems organise UI elements for you and make sound design decisions so you don't have to. Using a design system will make your app look and feel professional. It will also save you time.
Below are some of the systems you need sound reasons not to use.
You need components for responsive layouts, forms and lists. Select a design system and practice using it.