The server is overloaded or not ready yet OpenAI API error

What should I do this? Continuously getting this error!
Note that I’ve built an automation system to call API and create blog posts using OpenAI. but it’s not working!

I’ve premium account of OpenAI (paid account)
I’ve limit 5000 RPM and 160000 TPM.
So, still I’m facing the error. How can I overcome it?