I slip a t-shirt onto a pillow and then slide one side of the shirt over a music stand so I can raise it to standing height. Of course, you’d need one of the more sturdy music stands to hold a pillow.

Other than the music stand, I’ve also just stacked a bunch of pillows on a chair next to a corner of a room until I could get the target pillow up to standing height. Look around and see if you have a piece of furniture (dresser, chess, table) that will allow you to place the pillow at the height you want. I thought the couch suggestion above could possibly work if the couch is against a wall, has a relatively flat back, and you prop the pillow up on the back of the couch against the wall. Maybe one or two pillows (or a box, some other suitable object) to raise the pillow up a bit more to standing height.