Today I have realized that all my texts here are pessimistic. Today I realized that all my texts here are pessimistic.

Today I have realized that all my texts/posts here are pessimistic. Today I realized that all my texts/posts here are pessimistic.

"texts" works but "posts" sounds a bit more natural

I'm going to write a few posts about what I consider happineshappy things. I'm going to write a few posts about happy things.

flows better

Life includes some worthygreat/happy/amazing... things. Life includes some great/happy/amazing... things.

Worthy isn't the best word to use here.

Life includes some things that are worthy thingsalking about. Life includes some things that are worth talking about.

OnceThen, I saw him - a perfect ginger cat. Then, I saw him - a perfect ginger cat.

Once I saw him -I laid eyes on a perfect ginger cat. I laid eyes on a perfect ginger cat.

It was my dream thoughoutduring my studies. (to have a ginger cat). It was my dream during my studies (to have a ginger cat).

during flows better than throughout in this sentence.

It 's always been my dream throughout my studies.chool years It's always been my dream throughout my school years

There were a lot of photos of such cats ion my Pinterest feed. There were a lot of photos of such cats on my Pinterest feed.

There werehave always been a lot of photos of such cats ion my Pinterest. page There have always been a lot of photos of such cats on my Pinterest page

Maybe it's just a consequence of my admirationbecause of my love for lions, who knows... Maybe it's just because of my love for lions, who knows...

you wording works and make senses but I changed a few to make sentence sound more natural.

So we took him, aleven though the volunteer was a little bit strange. So we took him, even though the volunteer was a little bit strange.

Even though shows contrast a little bit better

All we know is that he was in a critical condition. All we know is that he was in critical condition.

Vets had to trim his ears, because they were seriously frost-bitten seriously. Vets had to trim his ears, because they were seriously frost-bitten.

Vets had to trim his ears, because they were seriously frost-bitten seriously. Vets had to trim his ears, because they were seriously frost-bitten.

And, as we knewfound out/ discovered much later, he had awful gingivitis. And, as we found out/ discovered much later, he had awful gingivitis.

found out works better here in stead of knew.

And, as we knewfound out much later, he had awful gingivitis. And, as we found out much later, he had awful gingivitis.

Vets had to remove all his teeth except four of them. Vets had to remove all his teeth except four of them.

Vets had to remove all of his teeth except for four of them. Vets had to remove all of his teeth except for four of them.

That's a pretty big amountlarge sum of money in Russia, believe me. That's a pretty large sum of money in Russia, believe me.

Can also say: That's a huge amount of money in Russia, believe me. That's a lot of money in Russia, ....

But we were glad towe could help our cat. But we were glad we could help our cat.

He meows all the time, excluding his own sleeping hours and "pats" time. He meows all the time, excluding his sleeping hours and "pats" time.

He meows all the time, excluding during his own sleeping hours and "pats" time. He meows all the time, excluding during his own sleeping hours and "pat" time.

Ginger can meow in so many ways. Ginger can meow in so many ways.

A little bit strange in expression here but the grammar is fine I guess

TI guess the volunteer, I guess, had named him. I guess the volunteer had named him.

OBut, on the other hand, Ginger is timid. But, on the other hand, Ginger is timid.

I think he was left ion the street; he almost died in that basement... Wwe're lucky to have Ginger. I think he was left on the street; he almost died in that basement... we're lucky to have Ginger.

And I'mit makes me happy, when I notice contentment and devotion in his eyes while I'm patting him. And it makes me happy when I notice contentment and devotion in his eyes while I'm patting him.