Are both okay:
We’re in the same group chat and I added you because I’m moving to New York next year and want to meet more ppl there.
And
We’re in the same group chat, I added you because I’m moving to Shanghai next year and want to meet more ppl there.
1. Correct 2. Incorrect.
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1. Correct
2. Incorrect. Comma Splice.
1 & 2. It might be better to say, "I added you to a chat group because...".
1 & 2. "ppl" is not a word. Save the textese for texting, if you must.