Not all heavier elements are from supernovae. This is known as nucleosynthesis ( https://en.wikipedia.org/wiki/Nucleosynthesis ) and there are a number of different origins of elements. Exploding massive stars really only get you up to Rb (atomic number 37).

I guess my habit of listening to PBS SpaceTime is paying off. https://iopscience.iop.org/article/10.3847/2041-8213/ac26c6

Current belief is many elements can’t be made by supernova and would require neutron star collisions