Oh, no, let's see if we can help. Sometimes it doesn't go well, but sometimes TLC works.
As a crested, the little one is at a disadvantage. But we can write more about the details later.
Since the duckling is just hatched, and I have only worked with day olds and older, I will share what I have learned from the forum.
There are likely neurological problems. Vitamins can help, niacin especially, and probably thiamine. There is a vitamin mix called chick saver, or sav-a-chick, and then there is a starter nutrient with probiotics also called gro-gel.
I would say at this point, nutrient support is what you can do, in addition to keeping the little one warm enough and so forth.
Hatching is desperately difficult for some ducklings, so he or she needs to rest, too, and that may help.
I would give some time before giving up, and it seems that you are also not willing to give up too soon. Good.
