ThaIt is very interesting to me as I can talk withto a lot of people from around the world.

Use the pronoun "it" to refer to the app, which you are describing as interesting. Consider using "talk to" or "chat with" to sound smoother.

It's a great chance to get to know the diversifiede culture, which I'm always curious about.

A "diversified culture" typically refers to a culture that has intentionally or naturally expanded in scope or range, often by incorporating different elements over time. This term is commonly used to describe a culture that has evolved or been influenced by a variety of external factors, leading to a mix of different traditions, practices, or viewpoints. A "diverse culture" refers to a culture that is made up of a wide variety of people, ideas, traditions, beliefs, ethnicities, or backgrounds.

It must be so great to explore and feel it in person; however, my financial status does not allow me to do it as I am a first jobbern entry-level employee.

It is slightly unclear what "it" refers to, although I assume it is referring to the possibility of experiencing diverse cultures in person. "First jobber" is not a title used in English. Instead, you will likely need multiple words to convey your intended meaning. Consider "however, my financial status does not allow me to travel as I just started my first job."

Firstly, the country I would love to visit is Thailand because it is quite close to my current stayresidence and through the movies and TVCes I watched I think its culture might be so rich and worth to explore.

"Firstly" is reserved for formal or academic texts.

And my checklist haincludes other names, including like China, Japan, the United States, Korea, Singapore.

It is fine to write "includes.....including," however, I have changed them to avoidance redundancy.

I hope I can doachieve my wish in the near future.