Hi
Let's be real here, It's very competitive to get a sponsorship that also in India.
This is the typical process :
You send request to company
The company asks for channel profile that contains : Engagement, Viewer Diversity, Language Stats and then you need to make them understand why you are best for the promotion and not you competitor. I can help you out with the whole process and help you grow the channel.
Hope you read all of it. I have experience in running and managing YT channel. Would love it if you wanna interview me.
Regards