Good developments. I have trouble hearing you in your videos quite often, not because of your English, but more the audio. I have pretty awful speakers though and it's common for me to not be able to understand stuff so the problem could be on my end. I like that you are going to make more blog posts, and I think working on thumbnails is a great idea. Looking forward to more from you :)
One thing could be that I'm running a semi-cheap headset and I don't think it catches my voice too well. Then at the other-hand my voice turned very low and such that I'm very quiet when I talk normally but I can also yell as loud as hell + obs is notoriously quiet with mic volume.
I think that could be it. It's just a little rough sounding and hard to hear, especially in combination with my shitty speakers. Not complaining though, I still enjoy the videos! :)