How should I focus this attached .blend

[Mastermind1 (Mastermind!)]

In my blend, I am trying to focus on a pile of doughnuts and then focus on them. While doing this, blurring the background and the side windows without losing some of the detail on them but making them quite blurred. How would I do this? I Have tried making an object a focus but it is not achieving my desired finish. This is a sort of blur I am looking for…

I will attach my .blend file if you would like to see.

Blend-Exchange

[Richard_Marklew]

One option is to just use the Defocus node in the compositor

[Mastermind1 (Mastermind!)]

Is there another option to add a higher blur to the background but not the doughnuts.

[Richard_Marklew]

@Mastermind!

Is there another option to add a higher blur to the background but not the doughnuts.

Separate objects on their own render layers and composite together