Debug and Optimize Existing ML System

I have a functioning machine-learning application with a solid core, yet bugs keep surfacing and the overall accuracy still falls short of what I need. My goal is to push every component of the model toward peak performance while stamping out recurring issues... (Budget: €6 - €12 EUR, Jobs: C++ Programming, Data Analysis, Debugging, Machine Learning (ML), MLflow, Python, Software Architecture, Visualization)