Hey man! You're doing a lot of stuff right, but there are quite a few issues there too, I'll give you a list of both.
GOOD:
-Well done Thumbnails (Just make sure to have a 'shadow' around your text to make it easier to read)
-Variety of games
-Facecam
-Good equipment (for a channel of your size)
FLAWS:
-Not enough commentary. This can be fixed by editing out boring parts of gameplay. Silence while there is a cutscene is perfectly fine, but while there is nothing going on; it has a chance to bore the viewer
-Intro is too long. You can shorten it up a bit by having shorter little clips, but all in all, an intro isn't very necessary, when I use an intro(I have 2 versions; one 5 second and one 12 second), it is usually on a special video and has a funny piece of gameplay before it to draw the viewer in.
-Audio levels are not very good. Just go in your editing program and lower your game volume a little and raise your commentary volume up a bit, you want to be able to hear yourself over a lot of action, but not to the point that it will hurt your ears
OTHER NOTES:
-Your icon is great, but the banner can use a little work, maybe invest some time into learning how to use photoshop well and iron out all the kinks, remember to put a 'shadow' on your text for the banner too
Hope I helped!
