Good Evening Bro,
Firstly, please note that my feedback is purely to help you and in no way or form is it negative criticism or to be taken offensive.
I went through your channel and watched a few videos and honestly loved your content and it's also well presented, however here is my feedback from my perspective on what could use some tweaking.
About: As someone has already mentioned, I definitely think you should broaden your "About" section to give new and current subscribers a better insight into who you are and what you trying to achieve .
Thumbnails: I feel like you need to have a little more consistency here as some of your Thumbnails are great and then there are others which I feel you just weren't all to bothered about.
Voice overs: Your speaking is brilliant, the only issue I have found with your voice overs is again the consistency of quality, sometimes its loud at other times its soft and then it's a mix of both with some distortion.
Overall: You are delivering your content well and all you need is a few small tweaks.
Side Note: I feel you should really setup a Instagram or Twitter account to promote yourself a little more, cause honestly I feel you have way to little subscribers for the amount a good content you have.
Furthermore, I wish you all of the best and please note that I am no YouTube Pro, I myself am just starting out but I've given you my opinion as if I was a viewer of yours.
Best regards,
Twothermal