Continuing Speed when changing direction

So I'm trying to get my character to run faster when a direction is double tapped. While I have that working, I want that speed to continue as long as ANY directional button is held down. That way they can change directions without reverting to speed of 2. I've tried making this work with GetKeyUp, using a boolean, etc, but nothing seems to be working the way I want.

         if(Input.GetKeyDown("w") || Input.GetKeyDown("a") || Input.GetKeyDown("s") || Input.GetKeyDown("d") || Input.GetKeyDown("a")&&Input.GetKeyDown("s") 
            || Input.GetKeyDown("w")&&Input.GetKeyDown("d") || Input.GetKeyDown("w")&&Input.GetKeyDown("a") || Input.GetKeyDown("s")&&Input.GetKeyDown("d"))
         {
             if ( ButtonCooler > 0 && ButtonCount == 1/*Number of Taps you want Minus One*/)
             {    
                 speed = 4 ;
             }
             
             else
             {
                 ButtonCooler = 0.5 ; 
                 ButtonCount += 1 ;
                 speed = 2;
             }
         }
         
         
         if ( ButtonCooler > 0 )
         {
             ButtonCooler -= 1 * Time.deltaTime ;
         }
         
         else
         {
             ButtonCount = 0 ;
         }
     }