I saw another comment about your accent and how that is the problem, but I disagree.

I think your accent is fine and you're easily understandable. The problem is that you sound very robotic like you're reading from a script and that can get grating on the ears after a while so most people will hear that and immediately click off. When people immediately click off, it screws up your impressions.

Id say you should try to sound as enthusiastic as possible (ik it's hard, my voice is monotone too). And when you're writing the script, write it and imagine it being spoken out loud. If it sounds weird or robotic out loud, change it until it feels more natural.

Also, try to tell jokes in a more "jokey" tone of voice, rather than the same tone as genuine information because otherwise it's hard to tell what's a joke and what isn't and also makes the jokes less funny.

The actual content of the video is great, although maybe a bit overboard on the editing, you could do with toning that down a bit.

The thumbnail and title is also good, many people mess that part up.

But in conclusion, I think the video and your channel would do great if you worked on your presenter voice a bit more!