Hello Karol,
The Copernicus Open Access Hub is gradually shutting down its operations. Copernicus Data Space Ecosystem is now the official platform that provides satellite imagery from all the Sentinel constellations and many more collections. Here is a guide to move your workflow from Open Access Hub to this new platform and I hope this solves your issue.
With Sentinel Hub, we do not provide data in the native netCDF format. Please look into the documentation and examples for obtaining Sentinel-5P data.