Enhance My Replit App with GPT

I've made significant progress on my app hosted on Replit, but now I need an expert to help me elevate it further.

Key Requirements:
- Fine-tuning of the GPT model to optimize performance and usability.
- Redesigning the app to improve its user interface, enhance the user experience, and modernize its visual aesthetics.
- Implementing a user authentication system to secure app access.
-Help set up emailing and text within the app.

Ideal Skills:
- Proven experience with GPT customization, particularly fine-tuning models.
- Strong background in UI/UX design with the ability to create modern, visually appealing interfaces.
- Proficiency in implementing user authentication systems.

I am looking for a professional who can take my app to the next level. You can view my current progress at https://wise-men-oracle-jausar.replit.app.