Your voice is echoing. You'll have to clean that up in post, padding some of the walls or get a shotgun mic.
Good video though, very knowledgeable.
The outro of "subscribing would be such a big help", I think you might wanna say what the viewer will gain from subscribing "Subscribe to see a new video every (day)", "Subscribe to see more of these videos", "Subscribe to join our growing community". Pick one.