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 to be very honest its actually pretty well setup and it delivers your niche in a well presented way. So i'm going to get right into it and tell you from my perspective what could use some tweaking.
Branding: Overall branding is nice and direct to the point as well as it also carry's nicely across your social media with the similar iconic branding.
Video Intro: Personally I absolutely love it, however I feel it is a little bit to long (Personal Preference) I always tend to try make any video intro 4 to 5 secs max as this is crucial as it can either keep a viewer engaged or bore them.
Thumbnails: I feel like you know what you need to do with the Thumbnails, but looking at your video wall it seems like with some videos you get lazy. You need to have consistency with everything, especially on YouTube.
Voice overs: Your speaking is brilliant and I've found you pretty much know exactly what needs to be said which 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: I think you are doing a great job, you are following all the needed pre-requisites (Descriptions, Titles, CC, Cards etc) just perfectly, with only some minor tweaks needed as mentioned above.
Side Note: A perfect starting mic is the Blue Snowball USB Mic (it's what I am currently using) and for software I recommend Audacity, it's a free audio editing software which is absolutely brilliant.
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