Art..fine. Got a logo, got a banner. Fine.
BUT...
I do not know why do i keep constantly telling this. I mean its OBVIOUS thing. Look at it like this...Your Youtube Channel is like your Room. And if your room is messy, would you bring any people into it? I do not think so.
Same goes with Youtube channel, CREATE PLAYLISTS. SORT THINGS OUT. Make it TIDY.
If you do not know what i mean, take a peak at mine. And see how i sort things up.
Also your videos, for example. A Subnautica gaming..45 minutes? unessecary..i do not know honestly but in my opinion I would not put in THAT much effort into youtube at your size of a channel. Its unnecessary...at least in my opinion. Like do ..for starters up to max 15 mins video or something. Also..when it comes to video ending. Dont make it like...3...2...1 SWOOSH. Try to toss in some fade out effects, create an outro. Smack it in there. I do not know what programs you use for editing however.