It's already enabled if you're going above 3.8GHz (base clock speed).
However, the Turbo speed is a little deceptive. Full info is here (https://www.intel.com/content/www/us/en/architecture-and-technology/turbo-boost/turbo-boost-technology.html), but basic summary is:
-- Turbo speed goes up in increments of 100MHz/0.1GHz (i.e. the steps for the i5-7600K would be 3.9Ghz, 4.0GHz, 4.1GHz, & 4.2GHz)
-- Actual turbo speed is limited by a) power consumption (i.e. more power available = the more steps it can use), b) avaialble cooling (i.e. lower operating temperature = more steps available) , & c) the # of cores in use (i..e the more cores used = the fewer steps it can use)
I had trouble tracking down the exact stepping for this CPU, but based on how prior-generation Core i5 CPUs performed, how they compared to their comparable Core i7 siblings, & how the i7-7700K performs (2 steps with 2, 3 or 4 cores, 4 steps with a single core), I'm guessing that your i5-7600K can Turbo up to 4.0GHz maximum if 3 or 4 cores are in use, possibly Turbo up to 4.1GHz if only 2 cores are in use, & only reaches the maximum 4.2GHz Turbo speed if only a single core is in use.
As for overclocking, everything I've ever seen shows that you should take things slowly. Going straight to 4.7GHz is just a blind shot in the dark. You should try incrementally bumping up the clock speed until it becomes unstable, then gently up the voltage until it becomes stable, & repeat until you reach the highest possible stable speed. Note that, in addition to cooling options, you run into "silicon lottery" limitations with overclocking: some CPUs are more robust than others, some motherboards are more robust than others, etc.
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