rubber tree plant leaves

Question

The leaves on my rubber tree plant are no longer big but are quite small. I don’t know why or what I can do to reverse this situation.

Answer 1

Small leaves can be a sign that a plant has a nutrient deficiency, especially of nitrogen or zinc. Here's how to supplement your plant with these nutrients:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/understanding-nitrogen-requirements-for-plants.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/zinc-and-plant-growth.htm