How to repair a river rock shower floor?

Hi all! I put down a river rock shower floor over concrete shower floor about 4 yrs ago. Besides the fact that it’s covered in soap scum, several of the rocks have popped loose and the grout is cracking and coming up. It’s in a certain area, not various areas, so my question is how and what do I use to repair this, and what’s the best sealer to reseal it? And what’s the best cleaner for future cleaning?

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