What's wrong with my Fiddle-leaf fig?
Sorry your Ficus lyrata (Fiddle-leaf fig) is not doing well. Ficus repotting is best done in spring time and your plant is stressed by having been repotted too late in the season. Now that the days are shorter there is less duration of light and plants slow down their growth. These plants like slightly cramped root conditions and your fig is in too big a pot at a time of low growth.
In spring if there are a lot of roots coming through the drainage holes, and the appearance of a network of fine roots on the surface, it’s probably time to repot. When maximum convenient pot size has been reached, top-dress plants annually (instead of moving to a bigger pot) with fresh potting mixture. Topdressing is just removing a couple inches of potting mixture and replacing with fresh. Looks like you will have to return to the original pot.
Courtesy of the NYBG Plant Information Service