Keynote - how to blur an image and text?

There is not a blur tool in Keynote, a work around is to open the image in Preview, open the Colour Adjustment tool

and move the sharpness slider all the way to the lefts ave then repeat if required

For text, use an image editing application, GIMP is free open source software: https://www.gimp.org

In GIMP, type your text, then go to Tools > Paint > Blur to apply a blur filter:

Gary,

Even a cup of dark roast did not sharpen that text. 😎