The i7-7700K meet the minimun requierments to run Win11. But its not suported, Why?

You ask Why? Here it is: Windows 11 is all about security and require cetain features from your system like something called MBEC (Mode based Execue Control) to be present in your CPU/MMU as well as the availability of DCH device drivers for core system components. Neither is available for the Core i7-7700K.

Your system will get full support with Windows 10 for at least four years to come (Oct. 25 2025) so there's no need for a new system right now. Btw. your shiny Apple Macbook Air will be end of support around the same timeframe and cut of new OS versions, too.