A nicely written sentence! We don't need to say "one day in the future", because we use "one day" and "in the future" in the same way. This means you can use one of them, but you don't need to use both. :)

I would like to wish you a great time in overseas studies soon.

👍

Great job! There are many ways to say you cannot do something because of money. “I can’t afford”, “ I’m not financially able”, “I don’t have the means”, etc. Because “one day” and “in the future” mean the same thing, you only have to use one. I hope this is helpful! :)