First Impression:
Your channel looks just a little bland. The color choice in your banner and the thumbnails are designed well enough... but the color scheme doesn't grab me. I guess in general your graphical choices just don't grab me. This is a good thing; it's very easy to fix. It's decent enough that none of this has been hurting you, but going forward you can definitely gain more attention with more eye-popping artwork in both your banner and your thumbnails. Considering that you are a musician I would think you could find someone who would trade some artwork for some music that they cold use in their videos.
I also noticed that you have a shelf of Shorts videos at the top of your page... that's a mistake. You need to have that at the bottom and your most popular uploads or your most recent uploads at the very top. Shorts videos are great on the Shorts shelf when someone wants to just swipe through a thousand quick vids while waiting in line at McDonalds, but nobody goes into YouTube looking for a selection of Shorts videos to watch. You need your best content greeting anyone who drops by your channel.
Finally, there is one glaring problem with your channel; the amount of content you have available.
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You only have 9 videos. Notice that when we look at your Videos tab YouTube doesn't even show the Shorts videos here. There's a reason for that! But yeah, nine videos just isn't enough. I know, you're new etc. Not a problem. But you do need to bury your head in the sand and get to work. When you have hit 100 videos then we can talk. By the time you will have a whole new perspective on thumbnails and audience retention and editing technique. Don't worry about subscribers; focus on making the best videos that you can and grow that library. The larger your library the more your videos will work with each other (especially if you are pinning comments, using cards/chapters and other Best Practices). The more this happens that more subscribers you'll gain.
Growth begets growth, and it is not linear. You have nearly 40 subs with about 10 videos... but that doesn't mean you'll have 400 subs at 100 videos. You should be far closer to 1,000 subs at 100 videos... and if someone stepped in here and had 10,000 subs at 100 videos it wouldn't surprise anyone. It all depends on that library. One of those videos can be a hit (you've already seen that with your 'Simple Trick to Mae Your Chord Progression EPIC' video. Learn from that success. Continue to reproduce the things that work. You are on the right track, you are doing it right. And the only thing that stands between you and any of these numbers is simply having a few more videos under your belt.
