tTo my potential friend,

The first letter of a sentence should always be capitalised

When you address something to someone, we add a comma at the end

Today iIt's March 17, 2025th today and the weather is sunny but a little cold outside.

This is technically more correct, though you will see what you wrote. Note - while you may sometimes see people write it like you do, no one says "March seventeen," aloud

I changed the word order to sound more natural

In the morning,Usually I get up at 6:.40 am.

I'm a little confused. Most of your post seems like you're talking about your daily morning habit, but your previous sentence makes it seem like you're talking about what you did this specific morning. I'm going to assume you are talking about a daily habit and correct it accordingly

I added "usually," because that helps to show that we're talking about a daily habit

I removed "in the morning," because "am," already says it's in the morning. You could also say "Usually I get up at 6.40 in the morning."

I changed the word order to sound more natural

In my opinion, this is a good habit for your health.

This sounds more natural to me

I spend a lot of time on my phone,. I'll check if there are any messages on social media or scroll through the shots.my feed

This should be two sentences. If you have two clauses (baby sentences with a subject and verb), then you usually need to connect them with a conjunction (words like "and,"), or split them into two sentences

I'm not sure what you mean by "the shots." I'm guessing this is what you meant

After that, until about 7:13, I will get up from myget out of bed and start brushing my teeth and washing my face.

I wouldn't say "until." It implies that you are doing the action before 7.13 and that you stop then. You're doing the action at or around 7.13

"Get up from my bed," wasn't wrong, but this is how people usually say this

I've been at it for 4 months. It's good for my toughness, but not for my feet, haha.Sso I'm planning to buy a bike at the end of thise month.

If you start a clause with a conjunction (in this case, "so"), it's called a "depandant clause." That means you need another clause in the sentence.

Before breakfast, I drank white tomato extract, which is rich in vitamin C. ThisIt helps the stomach and intestines to absorb the nutrients in the food.

It's more natural

I like to walk while listening to music or e-books. while walking

This is more natural

Today, I listened to the book "A Distant Savior", which contains deep thoughts and enlightening philosophical knowledge.

This one is...complicated

What you wrote wouldn't raise any eyebrows in casual writing, but in formal writing things get weird. There are correct and incorrect ways to write the title of books, short stories, movies, etc. Normally, a book title should be written in italics, and, if that is impossible, it should be underlined. Then, of course, it needs those capital letters. Because langconnect allows neither italics nor underlining, I vote that we only do the capitals. Using quotation marks, like you have here, implies that it's a short story

Also note (in case you don't know) - "savior," is the American spelling. If you're planning on using American English, then great. You'll also see people write "saviour." Most anglophones in Canada, the UK, Ireland, Australia, etc, spell it this way

I have the TV series adapted throughfrom this book.

I truly recommend you guys read it and evenreally dive into it.

It sounds more natural

I am sure you will find your savior.

Grammatically correct, but unclear from context

tTo my potential friend

In my opinion, this is a good habit for my health.

I spend a lot of time on my phone, I'll check if therI’ve areceived any messages on social media or scroll through the shoposts.

Because mMy skin is prone to allergies, so I have to maintain and take care of my face.

The sentence is fine in its original form, but it is preferable not to start with “Because…”.

Before breakfast, I drank white tomato extract, which is rich in vitamin C. ThisIt helps the stomach and intestines to absorb the nutrients in the food.

I have the TV series adapted through this book.

I truly recommend you guysthat you read it and evenreally dive into it.

I am sure you will find your savior.

The sentence makes sense on its own but the meaning in context is unclear. Perhaps we will find something enlightening about the series? Will we be saved (ideologically/philosophically) by it? A savior usually refers to a person or a deity (i.e. God), the TV series (object) on the other hand will perhaps provide us with inspiration/enlightenment?

An alternative:
“I am sure you will find it enlightening.”
“I am sure you will find it inspiring.”