What can I do to make the voices sound clear?

Hello everyone, i am making a simple video and noticed that the voices of the characters in my video cant hear them. So what can i do to fix this? or

Hello everyone, i am making a simple video and noticed that the voices of the characters in my video cant hear them. So what can i do to fix this?

or:Hello everyone, i am making a simple video and noticed that the voices of the characters in my video cant hear them. So what can i do to fix this?

or:You should hire somebody who knows how to do it. It's not an easy job and the equipment is not cheap.

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