Hi everyone, ¶
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Pretty happy to be part of the community.

I feel like iI need to enhance my eEnglish skills due to business purposereasons, so here iI am.

'for business purposes' or 'due to business reasons'

I'm currently studying cChinese (mMandarin) and eEnglish, willtrying to learn both.

language names are proper nouns and are capitalized

Maybe in another ahaha but that's it.

I hope to be capable of reading and writeing fluently someday; iI still feel kinda stiff when reading or speaking, that's why iI need more training iI suppose.

Hi everyone, ¶
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P [I am] pretty happy to be part of the community.

I feel like iI need to enhance my eEnglish skills due to business purposes, so here iI am.

I'm currently studying cChinese (mMandarin) and eEnglish, and am willing to learn both.

I hope to be capable of reading and writeing fluently someday; iI still feel kinda stiff when reading or speaking, so that's why iI need more training iI suppose.

Nice to mMeet yYou aAll/Everyone Here

Hi everyone, ¶
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Pretty happy. I'm happy/delighted/excited to be part of the community.

I gave synonyms to give more variety to your vocabulary.

I feel like i need to enhancPersonally/In my opinion, I need to enhance/improve/ameliorate my eEnglish skills due tofor business purposes, so here i am.

Ameliorate is a more formal synonym of the verb, improve. Unless you're going for a formal tone, I recommend sticking to words, including enhance or improve.

I'm currently studying chinese (mandarinMandarin (Chinese) and eEnglish, at the same time/simultaneously. I'm willing to learn both of them.

Maybe in another ahaha but that's it.

I hope to be capable tof read and write fluently someday; iin English someday. Right now, I still feel kinda of stiff/awkward when reading or speaking, that' in English. This is why iI need more training i suppose.

When you mean by reading, do you mean by reading in general or reading out loud? I also made your sentences sound more assertive, as you're willing to put in the effort to improve your English.

Thanks guys!

Alternatively, you can say, “Thanks everyone,” when addressing a general audience.

Hi everyone, ¶
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(I'm) Pretty happy to be part of the community.

It's doable in casual speech to omit the "I'm" here, but in writing it's a little more normal to include it.

I feel like iI need to enhance my eEnglish skills due tofor business purposes, so here iI am.

I think for is a little more natural for wanting to use English in business as a general idea.

Maybe in another ahaha(year? You need a time here), ahaha (I'm guessing this is just meant to be a laughing sfx) but that's it.

I hope to be capable of reading and writeing fluently someday; iI still feel kinda stiff when reading or speaking, that's why iI need more tprainingctice i suppose.

practice is a little more natural than training here I think. training brings the image of someone teaching or coaching you.