ALSO POSSIBLE]. I'm from Vietnam and now I'am living and working in Australia.

NOTE: The original is possible -- especially if *speaking.*. (If *writing* avoid repeating the word "I" twice in the same sentence. This is one way that spoken and written English differ.)

I start my day at 6 a.m, b. Before getting up and I do, I take some medications and breath deeply at bed,for around 5-10 minutes.

After that I go to bathroom and do my daytime skincare routine.

I likeprefer to eat alone because I canit is easier to focus on eating.

I'm working on a farm.

This job is challenging for me.

if it's aOn rainy days, I have a long day.the days seem long.

ALSO POSSIBLE: My favorite thing to dopastime is cooking.

(The original is also possible.)

In the evening, after I finish all things like cooking, having dinner, skincare, it's my studying timetime for study.

I'm learning English because I don't want my English skills to be my trouble to miss out on any chances in my lifeto miss out on any career prospects due to a lack of English.

I start my day at 6 a.m, but before getting up and I do some medictations and breathe deeply atin bed, around 5-10 minutes.

The way you phrased this, I wonder if you mean "meditations" instead of "medications"?

After that I go to the bathroom and do my daytime skincare.

I work really hard everyday, and my job depends on the weather.

I added a comma because these are two complete, independent thoughts.

iIf it's a rainy day, I have a long day.

I love cooking, Iand spend thing time cooking time like my relaxing timeis how I relax after working.

"I love cooking, and spending time cooking is how I relax after work."

I really feel grateful every moment whilen I cook.

"When" is correct too, but "while" sounds more natural.

In the evening, after I finish all everythings like cooking, having dinner, and skincare, it's my studying time.

I'm learning English because I don't want my English skills to be my trouble tothe reason I miss out on any chances in my life.

I start my day at 6 a.m, before getting up and I do sometake my medications and breath deeply at bed, around 5-10 minutes.

1. When talking about medications most people say "my medications" because "some" implies it could be any kind any amount belonging to anybody
Of course most people will probably know what you meant though.
2. I don't know what you meant by "at bed" it didn't make sense to me

After that I go to the bathroom and do my daytime skincare.

"the","a, & "my" all work here but "the" is most common

I have breakfast at about 7:30 a.m.

You could also say "I have breakfast around 7:30am"

I like to eat alone becauseso that I can focus on eating.

"So that" just sounds more natural but there is nothing wrong with saying "because"

I'm working on a farm.

You could also say "I work on a farm"

AlEven though I work hard, I try to go to gym 4-5 times a week.

Again this just sounds more natural

My favorite thing to do is cooking.

You could also say "my favorite activity is cooking" both are good

I love cooking, I spend the cooking time like my relaxing time after working.

A better way to phrase this is "cooking is how I relax after work"

I really feel grateful for every moment when I'm cooking.

In the evening, after I finish all everythings like cooking, haveating dinner, skincare, it's myand doing my skincare, then I spend time studying time.

I'm learning English because I don't want my English skills to be my trouble to miss out on any chancopportunities in my life.