Hey Jack,
I have seen the trailer and to be brutally honest that is where i would want to stop if I was a viewer, it really does not give me any clue of what you are about apart from possibly weird and eccentric which is not necessarely the thing that many people would go for. But most importantly, I have no idea what you do, who you are, what do you bring differently from other channels, etc.... If I were you, I would completely redo the trailer, add what you are about, what do you do, how do you do it differently from other, those are the three main points, then if you want you can add the usual upload times and other details.
I see that you thumbnails have improved a lot from the start, however you need to make sure that the text is visible, however your video quality and sound is good and your videos are quite enjoyable as well. So just work on the visuals/art of the channel and that might help.
Apart from that I am also struggling with getting subscribers, I have not gotten past the 20 sub count for weeks now and it just does not move, even though I just got over 1k views, so cannot help too much with subscribers, but I hope that helps.