I like it but a little big

I like this pillow a lot, but it’s just a little big for me. I’m 5’7 and have a king size bed. It’s hard to fit it under the covers to sleep with. I wish there was a medium size and a large size. I wish the cover was a little more formidable. In the pictures the covers look plush and thick but the cover I got is thin and the pillow looks a bit lumpy. I like it as a big back support pillow against the wall. I also like to be the big spoon and have the pillow be the little spoon. I hope a slightly smaller size becomes available so that it fits in my bed and under the covers too. Otherwise really enjoying it.