How to choose a topic for a poem with emotion as its topic?

One day after dinner, my parents, grandparents and I went out for a walk and saw a cleaner in his late fifties cleaning up the fallen leaves on the roadside. Fallen leaves are piled on both sides of the road. I looked at the piles of fallen leaves and thought that the cleaners helped people clean the peels, fallen leaves, scraps of paper, packaging bags and beverage bottles in obscurity ... They did good things for people and provided convenience. At the moment, I am looking at the blue sky and can't help but be lost in thought.

It was autumn before I knew it, but I didn't notice it at all. Maybe it's because I'm too busy studying. I was so busy that everything around me was ignored. I don't even know what color the flowers on the roadside are ... a year is almost over. Why didn't I notice it at all? How time flies! How time flies!

Now I know that I have neglected all the changes around me. Suddenly, my eyes lit up, and a maple leaf fell gently and finally fell into my hands. It is so red, so bright, so dazzling. Really beautiful! When it floated down, it was so light and slow, just like jumping out of one last dance. Of course, this is also the farewell dance it tried to perform.

Looking at the fallen leaves in our hands and thinking about the silent efforts of the cleaners, I think how beautiful our life is! On the way home, I held the maple leaf carefully, and I decided to cherish it forever.