I've read the info on your site on rubber trees; however, my issue wasn't addressed. I've had it for about 6 years and all the big leaves are slowly falling off but it's still growing new stems, only the leaves are small and curl. It's sickly looking and I want to cut it down and start new plants but first want to find out what I am doing wrong.
Certified GKH Gardening Expert
Curled and stunted leaves are typically caused by a pest infestation - scale most likely. They are hard to spot and may just look like bumps on the stem or underside of the leaves. This article should help: https://www.gardeningknowhow.com/plant-problems/pests/scale-bug-how-to-control-plant-scale.htm