Cruella would have been a good movie if it was called gaga and it was a fictional origin story for lady gaga. Keep everything the same just change all use of the word cruella to gaga.

hot take but ursula and hook would have been much better candidates for an origin film than cruella

captain hook: was the first lost boy. when he got too old peter pan tried killing him but only managed to cut off his hand. pan continued to kill the lost boys that grew up. hooks crew is made up of the survivors.

Ursula: was tritons sister and  next in line to rule. her fascination with magic lead her to change her lower half into an octopus and learn from the sea witches. her new power scared triton and so he banished her to the outskirts of the kingdom and took the throne himself.