Why was the plum pudding model replaced?

Why was the plum pudding model, a once widely accepted theory of the atomic structure, eventually replaced? Was it due to new discoveries that contradicted its assumptions? Or did technological advancements enable scientists to observe atomic structures more accurately, revealing flaws in the plum pudding model? Was there a particular experiment or breakthrough that prompted the shift towards a new understanding of the atom? As an inquirer seeking clarity, I am keen to understand the motivations and factors that led to the replacement of this historical scientific model.