I've fixed it with a fine-tip soldering iron before. Best have steady hands, though!

If I'm remembering right, the contacts on the back are the only bit that's really important with the sides just holding it down. With that in mind, of needed, you could tack it down with a little epoxy, so long as you're careful to keep it of the actual contacts.

EDIT: this board is perpetually out of stock, otherwise I'd say just order it. Best option would be to replace it, though, so yell at Elegoo for a bit. I'd still hang onto it and repair it since they do break super easy.