Okay where to start; so I've actually watched GoT theories from a bigger channel and I am a pretty big fan of the show so I'll try and go into as much details as possible.
Going to your channel the video that plays is an interesting topic the harpy one; but it's 8 months old and the autoplay doesn't do any favors for you because it goes "uhmm, uhmmm, uhmmm, uhmmm"
Ideally you make or you pay someone to make you a channel trailer to replace the harpy video with, something straight to point, badass and whatnot. To introduce people to your channel and what you're all about.
Your audio could use some better mixing and overall improvements, don't know what kind of mic you use if it's one of the better ones or not, so if you have a bad mic look for a better one or if you have a good mic then just need some editing adjustments.
Overall tone of your speech could be a bit more "energetic" as well while you speak. Plus there's moments where you're like licking your lips and it makes sounds, or just general mouth sounds that can be removed in editing.
Theories on their own are nice, it's always fun to see what other people imagine from a show, so no faults there.
Do you write a script for the episodes or just free-form it? One potential suggestion is do your commentary in gaps, IE: have a script - - - record a minute *pause* - - - record a minute and so on. And if you make a mistake, you re-record the specific part. You know?
The commentary needs a smidge more editing and planning to give it the really "professional" sound it deserves.
The thumbnails are good enough for the type of content it is; I'm sure it can get better with more practice an such.
Now another issue I see with the overall channel is the uploads are quite irregular and not often which is a hard thing to sell to an audience, so being more active with that will also go a long way with growing as a creator.
Hope any of that helps you. Good luck.
