Inquiry about the best way to link Whisper Large V3 to your website

hi
I want to link whisper large v3/openai to my personal website
When I use the serverless API, it usually returns error texts such as 503, 500, or 502.
Also the response is very slow
my way is Cut audio clips into 45 second mono stereo 48 kHz wav file chunks
Note that my budget is not enough to create an interface endpoint

What is the best suggestion to get better performance, greater speed, and fewer errors?
If I upgrade my HF Pro Account, will I get a better API service?