Hello there, and welcome to italki! :)

You made a few mistakes, but overall you are great at English!

My native language is Thai, and I want to improve my English skills because I will graduate in August and I'm looking for my first job. So if I have a very good command in over English it's will be (because getting a job will happen in the future) easier to get a job. Also to prepare for the future if I study abroad for master degree.
I am trying to learn Vietnamese and Korean too.
For Vietnamese, my parents can speak it well but they don't have time to teach me.
I have learned Vietnamese when I was about 5 years. I can count numbers and understand some easy words such as eat, go, greeting etc. but I cannot yet understand some long sentences yet and can't read anymore.
For Korean, I tried to learn by myself before. I can count numbers, can (doesn’t sound right) speak some easy short sentences and can read well but slowly & I can't understand.

So if I can speak many languages, I will have more opportunities

I think it's really cool that you know a little bit about so many languages. Keep practicing and I am sure you will do well! ^-^