Maybe, maybe not. Since you’ve got a reasonable amount of memory available and used by cache, things aren’t as dire as they might appear. Without traffic, it’s nearly impossible to tell whether you’ll have problems. Throw some requests at the system using a load tester, and see what happens. I wrote something recently on how to tune for memory usage and the metrics to look at, which will give you a much better idea of how swamped your system is than just looking at free.
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