I found those cherry shaped cheapie dummies would stay in my daughter's mouth. Because they are so round.
Others might say get rid of it now. .. do what feels right for you.
My daughter used to wake for a dummy. .and numerous other things! !
It didn't take her long to learn to put it back in.
That said. .if you want to change to a comforter I used a small muslin square. I think you can buy packets of them from target. I would sleep with it so it would smell like me! Then put it in her cot. I also used to tie a dummy to the corner of it. Easy to replace if you need to.