Resizing art board

If I made a flyer on a 5.5 by 8.5 artboard but I also need the flyer to be 8.5 by 11. Instead of just distorting the flyer and making it a bigger size is there a way to resize my artboard and also my elements? Or do I just have to remake the whole thing?

in indesign you have a nice scale by X percentage tool where it’s quite easy to proportionally shrink/expand a whole bunch of elements but not sure illustrator has that.

i wouldnt distort anything personally :>

if they are simiar-ish sizes maybe you can get away with just fixing the background to fit the size and then having the other elements the same… but i would assess each flyer on its own…