In tThese days, cinematic vlogs are so popular among the vloggers.

The "in" is not necessary. The phrase "these days" is used far more frequently

They areVloggers recording from a lot of differentvariety of angles, perspective and also they decorate their video with unique edits.

When I first read your sentence, I was unsure if the subject was the vloggers or the vlog itself. It was only until the end when I read "decorate the video the vide with unique edits" that I realized that the subject was the vloggers. I was confused because in the previous sentence the subject was "cinematic vlogs"; therefore, I expect "they" still referred to "cinematic vlogs". Therefore, it is important to specifiy your subject, especially when the subject changes from one sentence to another. If you were talking about "cinematic vlogs" when you wrote "they" then the sentence would be: "They are recorded from many/a variety of angles, perspectives and decorated with unique edits".

It’s so different from the old vlogs because back then people were just recording what were theythey were doing, and the videos were going so linearly.

When using a coordinating conjuction (FANBOYS: for, and, but, or, yet, so), when it connects two independent thoughts, use a comma before the conjuction. Take for example the following sentences:

I love ice cream
Mary hates ice cream

If we wanted to highlight the differences in our preference for ice cream, then we would say: I love ice cream, but Mary hates ice cream.

Finally, the last phrase of your sentence is understandable but sound clunky ("the video were going so linear"). It would sound better if you said: "The videos were recorded in a linear fashion." This way it focuses a bit more on the technique of old vloggers and sounds clearere

I am one of the old vloggers, so I wanted to enchant my vlogs like these.

Excellent word choice with "enchant"!

FA few days ago, I wondered my level for recording to this type of vlogs and Iif I could record a cinematic vlog; therefore, I decided to recorded a cinematic video that shows my getting up from my bed, going the kitchen, and pouring a glass of water… I can say that I was way better that I had thought.

"I wondered my level" sounded a bit cluncky. "I wondered if I could" or "I wondered if I would be able to" are better alternatives.

Next, rather than use "and" (...and I recorded...), use "...., so..." or "...; therefore,..."—- "so" is a grammatically easier form and serves the same purpose, so I would recommend using it. Use "so" when you want to illustrate how one action or idea prompted another thought or action. "I could hear the scream of a child, so I ran away as quickly as possible."

"Pouring water" sounds quite ambigous. Where are you pouring the water? Are you pouring it in the sink, a kettle or a nuclear reactor? So "pouring a glass of water" is more clear. However, if you weren't pour a glass of water, just specify were you were pouring it. Upon writing this, I myself wonder why I "pouring water" sounds so strange without additional context. But I think the phrase "pour a glass of water" is so common that I am just expecting to hear it and if not that, then something else specific.

I onlyjust wanted to learn my level, but now I have a really funny water drinking water video with so much seriousness and cinematic atmosphere.

"Only" could also work, but "just" sounds more natural.

They are recording from a lotvariety of different angles, and perspectives, and also theythey also decorate the video with unique edits.

FA few days ago I wondered my level for recording to this type of vlogs and I recorded a cinematic video that shows mye getting up from my bed, going to the kitchen, pouring water… I can say that I was way better thatn I had thought.