There could be a few reasons why the hotspot feature is grayed out on your device. It could be that your device doesn't support hotspotting, that hotspotting is disabled in your device's settings, or that you don't have a data plan that supports hotspotting.
If you're not sure whether your device supports hotspotting, you can check the documentation or contact the manufacturer. If hotspotting is disabled in your device's settings, you'll need to enable it before you'll be able to use the feature. And if you don't have a data plan that supports hotspotting, you'll need to sign up for one before you can use the feature.