Proved the atoms were arrangements of the four elements, not so much.

Wasn’t the Epicurean position. Lucretius only surmises that there were likely a few handfuls of base forms of indivisible parts and then a multitude of their combinations. In fact, he rejects the elemental view.

And given we jumped the gun on naming ‘atoms’ after the word for indivisible, the closer philosophical parallel to modern concepts is quanta. And in that context, you even have Lucretius claiming that the behaviors of said indivisible parts must have a degree of indeterminate outcomes beyond following static physical laws for there to be free will (long before Bell’s work relating the behavior of quanta to superderminism). He also surmised that light was made up of indivisible parts that were extremely light and moving very, very fast around 2,000 years before Einstein proved the discrete nature of light.

They were right about everything from survival to the fittest, contribution of traits from each parent, the quantization of light, and the indeterminate behaviors of quanta literally thousands of years before these things are proven.

It wasn’t mere happenstance that they ended up being the most correct about the physical world of all the schools of philosophy in antiquity. They had a concrete methodology behind their success, and frankly it’s a methodology that modernity would do well to have learned more from.