A vVery Reasonable Statement

You can watch it here: https://youtu.be/21jMFQkgu-g ¶
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I dihadn't realized how long I had put it off for so long until I uploaded it.

Every time I go through a diseasesome sort of illness, I understand this sentence better.

- This is the most important project for me in this year of sthe Snake.

A vVery Reasonable Statement

Every time I go through a diseaseam sick, I understand this sentence better.

Sounds more natural

A very Rreasonable Sstatement

Based on the content, is it just a reasonable statement or more of a wise statement?

It's about thea hike to Xingmeijian that I went on aone month ago.

If its a month ago, style wise you could also use the number.

Every time I go through a diseaseet sick, I understand this sentence better.

Overcoming a "disease" is a much more severe case, therefore its assumed you're implying a lower stakes typical illness.

When I watchAs I dubbed thise video, I knew at whichat one point I had to stop because my nose was too congested o. Later I was so dizzy that I had to lie down and rest.

In this case you didn't just watch the video, you added a dub to it. I split the sentences to avoid an overly long statement. I would not use "or" to connect those two examples since they're are not contrasting ideas, they're similar. At first it sounded like you were this sick during the hike, but then the phrase "I had to lie down and rest" wouldn't have fit.

I need to update my exercise routine and adjust my diet to keepstay healthy!

Although "keep healthy" is gramatically correct, the more natural way to say it is "stay healthy". Alternatives are "maintain my health."

- This is the most important project for me in this yYear of sthe Snake.

Stylewise its recommended to capitalize Year of the [Animal].