NooB question: Is there a way to allow Dynamic on-demand Overclocking?

[Desertsweeper]

SO I final rolled up my covid-unemployed sleeves and decided to overclock my i7-8700K. I poured over threads here and bought what I needed and tinkered away for days. All went very well and I easily reach a very stable all-core overclock of 4.8 Ghz which really boosts my PC's usability. But it ALWAYS runs at that speed...Am I missing something or is there a way to have it idle where it is supposed to at 3.7 Ghz, and then on demand, do an all-core (sustained) boost to 4.8? If I am just browsing the 'net or in the bathroom, I don't need it devouring power and spinning up fans like crazy. But when I go to render a YouTube video I want it to run full-tilt at 4.8 Ghz. I would appreciate anyone's comments.
My system if it helps:
Asus Prime Z370-A with i7-8700K
4 x Crucial Ballistix Sport LT BLS2K8G4D240FSB 2400 MHz 8GB Modules
1TB Samsung NVMe

 

[bmwbaxter]

In your bios make sure you have EIST (enhanced intel speed step) turned on. This will allow the CPU to downclock when not in use then turbo when needed.

 

[EarthDog]

Be sure Windows is set to the balanced profile as well.

 

[Desertsweeper]

Thank you BOTH for your amazing suggestions - it was the combination of both that worked. It now idles at 800Mhz and all-core boosts tp 4.8 under load. Absolute genius! Much gratitude