Either start over, or place the content of that pot in a bigger pot with some new soil and dont give water for a couple of days.
If none of the leafs move up or new growth occurs; its as good as over.
If the bottom of the bag fills with water and the bottom of the pots roots is not above it, you drowned them.
Also, 2 nodes down, that stem looks deep purple, like it had a massive cold shock, could that be ?
btw, that a clone or from seed ?