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There are a few things you can do. As you mentioned, defragmenting is not only a relic of the past, it is actually harmful to SSDs, so certainly do go down that road. Probably the easiest and most effective thing you can do to extend the life of an SSD is to disable hibernation, which require that a large amount of data be written on the drive every single time the machine hibernates. I had to look up the steps to disable it on Windows PCs, but here they are courtesy of cnet:
1. On the Start Menu, find "Command Prompt" and right-click it.
2. Choose "Run as administrator" and answer "yes" to the User Account Control security prompt. (This is called running "elevated Command Prompt." Note the procedure, as you will use it again below.)
3. When the Command Prompt window appears, type in powercfg -h off and hit Enter.