Machine learning Python Full-Stack Debug & Optimize: Need someone to tell me what's missing and how to make it fully work

I have a full-stack application written primarily in Python. I need someone to tell me what's missing and how to make it fully work. Certain features refuse to work consistently, and overall response times are noticeably slower than they used to be... (Budget: $10 - $30 USD, Jobs: Debugging, Full Stack Development, Machine Learning (ML), Python, Software Engineering)