Your Switch needs to be hackable. If yours is any revision beyond the initial release chances are you are out of luck. I set it up a long while ago so I can't recall the steps, but googling "Nintendo switch overclock" will get you what you're looking for.
The Switch is based on the Nvidia Shield, whose stock clocks are roughly double the Switch's. This means you can OC it without exceeding the manufacturer's specs, which is pretty neat. Bringing the memory clocks up really helps titles like ToTK.