There are many issues present,
First is the waterfall it does need to be re-waterproofed $1k+ as I am seeing water loss on backside, also there may be earth movement around the waterfall that is causing this as well.
More earth movement on west side of pool, sinking concrete and lifting coping, this 10 x 10 section to demo and replace would likely run 2 to 3000+.
I am seeing cracks, going through the skimmer throat on both sides of the skimmer, which is fairly unusual, they go down into the skimmer throat and into the pool several inches, so likely at the least I would imagine the skimmer area will need to be reinforced and redone 3-5k+
The concrete decking around the pool is in good condition overall it’s just there are some issue on the east side of the pool that is causing all the concrete to move her shift, = lifting concrete around east skimmer / settled Concrete more likely around east side of Concrete pool decking.
Still to prevent trip or injury, recommend at the very least grinding and filling this one area on the east side and one area on the west side as well as one in the middle end (2-3k+)
Note all of this movement is not normal and is a sign of things coming, as settling will likely continue.
Note rock grout is also likely due to be checked for water loss due to how much movement is being seen around the entire pool structure. 1-2k+
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