Break it with a sledge. Put in new wire mesh, rebuild up the settled stone, compact it. Run expansion joint around perimeter only. Fill it up with Crete. Joint the floor into 4 pieces. California finish it so it looks pretty. That is all you can do to that floor. Any bandaids will not solve this issue. Good luck
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When I was a child, I used to talk as a child, think as a child, reason as a child; when I became a man, I put aside childish things.
1 Corinthians Chapter 13 - 11