tTowards studying abroad

I'mm going to do so in Fiji.

There is no deeper meaning Iin chose theosing Fiji.

My firiend told me about studying abroad in Fiji the other day and I was interested in Fiji.

I want to study abroad inone previous time and I feel it is good opoportunity for me.

So I decided to do todayday to do it.

"I decided to do it today" is ambiguous over whether you just made the decision today, or went to Fiji today, so it's better to move today earlier in the sentence.

I think my English skill is at a (medium / middleing) level.

We normally say "medium" level rather than "middle level" when evaluating skills. You might also hear "middling level" - despite it's connection to "middle", I actually think "middling" is more negative than it would seem at first glance.

Therefore, I started to write a diary for my studying abroad program.

This is a good English sentence after adding the "a"

Looking at your Japanese translation, I think "To prepare for my studying abroad program, I started to write a diary" might capture the nuance a bit better. That's because "for my studying abroad program" could mean either "as a homework assignment for a program I've joined" or "as practice so I'm ready to study abroad"

I'm Yuttaso.

Working towards studying abroad

Im going to dostudy in Fiji.

There is no deeper meaning for why I chose the Fiji.

My firiend told me about studying abroad in Fiji the other day and I was interested in Fiji.

I previously wanted to study abroad in previous time and I feel it is good opoportunity for me.

So today I decided to do itoday.

I think my English skill is middlis at an intermediate level.

Therefore, I started to write diary for my studying abroad program.

Nice to meet you, everyone all!

I'm going to do it in Fiji.

There is no deeper meaning for why I chose the Fiji.

My firiend told me about studying abroad in Fiji the other day and I was interested in Fiji.

No need to repeat the topic of interest in this case.

I want to study abroad in previous time and I feel it is good opoportunity for me.

Not sure what you were trying to convey in the first segment of the sentence

So I decided to do it today.

I think my English skill is middls are at an intermediate level.

I'm Yuttaso.

Nice to meet you, everyone!

!

t(Working) Toward sStudy aing Abroad

Generally, every word in a title is capitalised.

Today, I decided to study abroad.

Alternatively: "Today, I decided I will study abroad." I'd prefer this alternative, but your original sentence is fine.

I'm going to do so in Fiji.

The "so" here refers to the act of studying abroad.

There is no deeper meaning I chose thebehind me choosing Fiji.

My firiend told me about studying abroad in Fiji the other day and I was interested in Fiji.

I'd wanted to study abroad in previous timely and I feel it islt this was a good opoportunity for me.

Mind the tense. The order of events is:
(1) You wanted to study abroad. → (2) You felt this was a good opportunity. → (3) You decided to study abroad.

Event (2) occurred before (3) only, so the simple past is fine for (2). Event (1) occurred before (2), which occurred before (3), so the past perfect is expected for (1).

So, I decided to do todayday to do so.

Moved "today" to the front to reduce ambiguity. The sentence "So, I decided to do so today" has two possible interpretations:
(1) You will study abroad today.
(2) You decided to study abroad, and that decision was made today.

I think my English skill is middlat an intermediate level.

Therefore, I started to write diary entries (in preparation) for my studying abroad program.

In this context, "study abroad" is a noun.

I'm Yuttaso.

toward sStudying abroad

Today, I decided tohat I will study abroad.

I'm going to dgo into Fiji.

There is no deeper meaning as to why I chose the Fiji.

My firiend told me about studying abroad in Fiji the other day, and I was interested in Fijit.

I already wanted to study abroad in previous timbefore and I feel that it is a good opoportunity for me.

So I decided to doapply today.

I think you meant that you will apply today. If not, and you're actually travelling today, the sentence should be: So I decided to leave (or go) today.

I think my English skill is middle levelintermediate.

Therefore, I started to writeing a diary for my studying abroad program.

I'm Yuttaso.