[R] Retraining a CNN with noisy data, should i expect this to work?

I’ve been teaching myself how to build and tune CNN models for a class, and came across this github from somone who graduated a couple of years before me. I want to improve on their methods and results, and all i can think of is to either expand the dataset (which manually cleaning seems very time consuming) or simply adding noise to the data. I’ve ran a few tests incramentally changing the noise and im seeing very slight results, but no large improvements. Am i wasting my time?

https://github.com/alirezamohamadiam/Securing-Healthcare-with-Deep-Learning-A-CNN-Based-Model-for-medical-IoT-Threat-Detection