I understandam familiar with this kind of life very well since, considering I grew up in the countryside at my grandparents’ house during my early childhood.

Not bad at all. I provided an alternative for how else you could have worded this!

Imagine this: you see the green, luscious fields and meadows that stretching endlessly tover the horizon.

Again, only alternatives. Sometimes less can be more!

The blue azure sky with white clouds gently drifting along the direction ofin the wind.

The morning haze and fog were, still, unfazed in the distance, wafting around the forests and mountains.

I removed "the" before forests and mountains only because you are describing an imaginary landscape, opposed to a specific, real place you are actively describing.

The pleasant sound of birds and insects chirping comes from all sources, and tand buzzing from all directions. The rustling of the leaves and the placid bubbling of the nearby stream serve as a rhythmic melody gifted by heavenly nature.

tThe gentle, chill breeze whirls around as the sun startbegins to rise from the east.

As soon as you open up the window, you can see the mesmerizing view of the vibrant sunrise and the, trees, greenery, and a littlesmall radiant garden in full bloom.

The reality may not appear as sweet as theseis imaginationsery, but waking up fromat your own cottage house in such a tranquil place is a blissful dream I frequently fantasize about.

The morning haze and fog weare still unfazed in the distance, wafting around the forests and mountains.

Since the rest of the paragraph is using the present tense, I think it would be better to say this in the present tense as well.

tThe gentle, chill breeze whirls around as the sun starts to rise from the east.

Just a capitalization error and also a needed comma to separate two attached adjectives. If you mean to say that the breeze is gentle and chill, then the comma is needed. If you mean to say that the chill breeze is gentle, then no comma is needed.

As soon as you open up the window, you can see the mesmerizing view of the vibrant sunrise and the trees, the greenery, and a little radiant garden in full bloom.

When writing a series (list with more than two things), it's customary to use the same format in each. In this case, since "the vibrant sunrise and the trees" has articles with the nouns, and since "a garden" has an article and the noun, "greenery" should have an article as well.

To take this further, here are the three items in your series (as you've written them):

1. the vibrant sunrise and the trees

2. greenery

3. a little radiant garden in full bloom

There is a little bit of asymmetry, since items (1) and (3) are very descriptive (especially 3), with verbs and/or adjectives included, so you could consider adding an adjective and/or verb phrase to (2), like, for instance, "the vibrant sunrise and the trees, the stunning greenery, and a little radiant garden in full bloom."

The reality may not appear as sweet as these imaginations, but waking up from your own cottage house in such a tranquil place is a blissful dream I frequently fantasize about.

The comma precedes the conjunction, which here separates two independent clauses.