u/5danish

I’m starting the Quintessential Cardigan, size 4. It is bottom up. The gauge for the pattern is 22sts/4” and I got gauge on US5 needles. I’m almost done with the ribbing for the back. It measures approx. 17 inches in length, but for my size I want it to be 20 inches in length. Do I need to cast on more stitches, I.e. knit a larger size? Or am I ok?