So he has 2 channels. One in English and one in Hindi.
Unsurprisingly, his hindi content is doing better than his english content. Across the board the hindi version of the videos have more views and likes.
I hate to say this but a lot of americans and europeans will click off if your accent isn't either from North America or Europe (or australian /new zealand too I guess). Some people find it too hard to understand, I think it's mainly western bias. Even myself who speaks multiple languages most likely would have clicked off and looks for a western sounding english video. I'm not saying it's fair or even good. Just giving you my honest feedback. This might sound offensive but I think I would have a hard time growing a channel if I spoke hindi because my accent would likely be very strong. Like wise I think his English channel is going to be harder to grow. Convincing someone your content is for them when you don't sound like them is tricky, but I've seen it done many times (typically people who make physical stuff or teach stuff though).
His channel is doing "just fine". Looks like his first video has a higher amount of views. I'm guessing he promoted his first video with his friends and family and isn't doing that any more. If he wants to grow, he's going to need to promote and collab often. If he's your boss, then maybe he should collab with you and then you can share the video that you were in. And he can collab with others in the industry (though I'm not sure what industry this is). If he does 20 collabs, that's 20 different groups of people sharing the content out and 20 networks of friends and family. If he keeps it up I'm sure he will grow his channels. This channel is new which explain the low view count but he making content that will actually help people.
typically, I would suggest focusing on one target audience, but i think since he has two channels one in English and one in Hindi they can have two different target audiences.
(I'm just going to type the rest of this as fast as possible because Im overthinking it)
He should answer these questions for both channel
Who is his target audience
What do they like?
What do they need?
what is their education level?
where do they live?
what jokes do they find funny?
what kind of youtuber do they watch?
etc etc.
It really helps to get this down before he make a lot of videos so someone in his target audience who clicks on his video know this content was custom made for them
Case and point - the way i talk to my parents is not the same way I talk to my friends. If I was making a channel with my parents being the target audience the style and pacing of the video would be very different than if I was making content for my friends even if it covered the same topic.
as for thumbnails - looks mainly good to me
channel icon - i wish it was closer to his face
ps. I realize in this post it sounds like I'm assuming his english content is for westerners . I'm not actually assuming this. This assumption was made for the sake of the post, because otherwise I started over thinking this post waay to much
I know there are waaay more english speakers from non western countries and they very well may be the main target audience for his english channel, but I can't exactly speak from that point of view without overthinking everything.
Best of luck with the channels. sorry for all the rambling just trying to help.