I watch YouTube almost every day, and I've subscribed to channels aboutthat each feature a Shiba dog because I'm a big fan of Shibas.

I'll show youtell you about two of my favorite channels.

In this context "show" would usually mean showing the videos to us, rather than writing about them.

The channel uploads videos about a black Shiba dog, Max, and the videos are about one minute so it'slong, so they're easy to watch.

"it's" for the "the channel is easy to watch"
"they're" for "the videos are easy to watch"

In the videos, he speaks in weird English, such as saying "hooman" (human).

(Actually, Hhe looks brown, but we call the coat color red.) He is very round-shaped and cute.

I like the videos' titles; thesey are humorous.

Or: "I like the videos' humorous titles."

I heal daily tiredness enjoying these videos.

Your sentence works, but something like "Watching these videos every day rejuvenates me." sounds more natural. Other options besides "rejuvenate" could be "refresh" or "reinvigorate"

I watch YouTube almost every day, and I've subscribed to channels about a Shiba dogs because I'm a big fan of Shibas.

The channel uploads videos about a black Shiba dog, Max, and the videos are about one minute long so it's easy to watch.

I heal daily tiredness enjoying these videosEnjoying these videos heals my daily fatigue.

Your sentence is grammatically correct, but I feel like it sounds more natural the way I have written it. Fatigue fits a bit better in my opinion - but tiredness is not incorrect.