Not always does Crystal disk completely shine through the disk.
Had a sandisk 512GB SSD which was completely fine.
One day it suddenly became very slow with read and write performance. It was in the <20mb/s range amd painful to recover data from.
CrystalDisk said everything is fine. Health = Good.
Regarding the write cycles: If they ar used up the cells should enter a read only mode so that you should be able to recover the data from. Bad time if it’s the OS though.