You have more views and subs than me, so please take my constructive criticism with a pinch of salty goodness.....
You could really use a better mic. I use the Snowball Blue mic on my channel so you could check that out for a comparison (not competition). I suggest that one because it's not hundreds of pounds of dollars and its within the budget of most people. It's just a shame that your footage is good quality and your able to talk with some good fluidity and the quality is letting you down. In case you do check out my mic quality, I haven't really adjusted the settings so I'm sure you could get better quality out of it than me !
Keep at it bud, your doing a great job !