Throw it away. It's no use. If you really like this dress, if you can't bear it, you can buy a pack of clothes and dye it again. It should be darker than the original background color, and the red color should be crimson wine, purple coffee and so on. But clothes should be the same color, and it would be weird to dye them in variegated colors.

Taobao costs a few dollars, 1 bag.