How do you say "So everyone, study hard!" in Korean?
I think it's like 그래서 여러분, 열심히 공부해요! But I'm not very sure about that. I need it not in the most polite form like "합니다" "습니다" or "입니다" but in the semi polite form like "요." So please make sure it is in that form.

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That's too hard. It's unnatural to say like that

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그래서 모든 사람들에게, 공부도 열심히

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"여러분, 공부 열심히 하세요." usually, it's teacher's sentence for student.

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Hello
Actually it kind of depends on the context as you can for example use '그래서' or '그렇니까'
So I would need more details in relation to which one to use
The other part is correct, but I would say 여러분, 열심히 하세요. It is more polite and sounds better
Hope this helps^^

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