I have my own interpretation for this short interesting poem.
In this poem, owing to the image illness that we would easily figure out
in it, I think the poet was writing about the cycle of life. 'l' could
refer to leaf of course, but of course it was similar to the first person
singular 'I' and also 'life'. Here the poet would make me connect the
similarity of the leaf and me, both having existed in the world in the form of
'life'. The leaf falls and revolves in the air, seeming to be a way to
manifest the value of itself as mentioned in existentialism. We live a life as
well, and in this few decades we show our best to our audience