How do you give your characters strong voices?
“Oh, Mr. Bennett, you do delight in vexing me!” Can you hear Mrs. Bennett saying that? Every time she speaks you know what her accent is going to be and you know that she will be talking about her lack of money or her poor nerves. That's Mrs. Bennett.
Your characters need to have very strong voices, too. They need to be unique and fun, but also predictable. Meaning they need to be so well done that the reader knows who is speaking just by the line of dialogue, without any tags.