fractal noise waves around border screen

hi, so in the image above, I used roughen edges in order to create those shapy edged waves,
I used "strech width or height" and as you see I streched the width, thats the look I was going for the edgy waves
but how can I strech both width and height in order to make it look like on the draft I drew in blue, so that wavy edge come both from up/down and the sides?
when duplicating this layer and streching the height, the waves overlap and cut each other as seen here,

