Newsletter sign-up form with success message with React "useReducer"

The project initially seemed simple, but since I am currently learning React, I decided to develop it using React. I found it easier to perform validation using the 'useState' hook in React. However, as I am currently exploring the 'useReducer' hook, I decided to utilize it for my project, particularly for implementing live form validation. Now, the form aligns perfectly with my vision and goals for the project. Furthermore, I would greatly appreciate it if someone could review my solution and provide advice on how I can further enhance my knowledge and skills.