Reality is quintessential.

It's important to remember that the idea behind the Four Elements was to explain what the underlying substance (or substances) is/are behind all things in reality. Empedocles established that there are four roots that underly all of reality. This was later embraced by more influential Greek philosophers - most notably Aristotle - and became the canon of natural philosophy up until the advent of modern science. It was understood that nothing in this world is made up of just one element, but that all things in reality have all four of the Elements within them. The ratio of each could vary and was part of how the nature of a thing was determined. Humans in particular were understood to be balanced among the Four. When they were not, they were said to be mentally or physically ill.

In part because of this, I regard questions like "what Element are you?" to be more like a quaint child's game, no offense intended. I think we can validly ask "what Element do you like the most or do you feel resonates with you the most?" but the previous question is more dicey. If it is a valid question to ask, most people who go about determining their so-called Element don't do so from a position of strong knowledge about the Four. If you have a strong knowledge of the Four, you don't tend to ask the question. You either recognize it as a non-question or you already know what "your" Element is based on experience/knowledge.