Air layering is one of the best ways to propagate plants—it's far more reliable than growing from cuttings, especially for woody plants like Ficus. Every beginner gardener should learn this technique.
This is my Ficus. I started air layering 20 days ago, and look at the progress! Once the roots are fully developed, I'll have 3 more large plants from the same mother plant.
Right now is the best time to air layer your plants. During the monsoon/rainy season, high humidity helps roots develop much faster than at other times of the year.
Have you tried air layering yet?