I was a quilter so I quilted. Not very well but it kept me as sane as I was going to be. Very simple wall hangings mainly, so not mentally challenging. I also found jig saws really good. My brain often didn't work, and doing a jig saw passed some time and was a distraction. I also knitted very simple things which I now don't know what to do with! I also did some de cluttering like some other ladies, quite therapeutic.
wishing you the very best luck, I agree with others, chemo feels endless but it ends which is wonderful. Karen