Not sure what you run this on and why its $50/day but sounds like a lot.

Convert your server cost to a pay as you go model. You are currently paying even for time when your server is idle. Containerise your app and run on something like AWS Lambda which has a pay for what you use model.

- s3 is cheap for storing your model data and as long as you are just reading that should be fine.

- AWS Lambda has 1 million free invocations per month in free tier.

- Post that you pay $0.60 per 1 million requests

- AWS stack is just an example, you can easily use GCP Cloud run or any other equivalent service.