How to bring up the crotch of pants?

Hello!

I recently thrifted a pair of pajama pants, they are made of a thick knit material, similar to that of a sweater. I can provide a photo if needed.

I want to wear them a bit more low rise, and when I do, the crotch portion is near my mid thigh as I’m assuming they are originally high waisted.

Any advice on how to fix this? When I looked at YouTube videos online, everyone just sewed a new seam on top of the pre-existing one. When I tried this, my pants became extremely bunched up and looked strange.

I’m assuming I’m going to have to take the pants apart entirely— but I wanted to check if anyone has suggestions on how to fix this before I do. Thank you!