Hi, make or capture a photo related to your content. Aside from relevance, make it looks exciting for people to be curious about your video. Good luck and have more subscribers soon. Keep it up!
Your question is a bit too broad. I would suggest sharing one of your thumbnails in the YouTube Thumbnail Art & Photography section of the forums so members can review your thumbnail and provide some feedback.
As for your other question I recommend reading the posts in these forums to learn ideas and tips to grow your channel. Asking a broad question like how do I grow my channel won't get you any real help. Be more specific as to what exactly you want to know.
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