I'd fertilize it too with your favorite fertilizer. Anything from bunny poop, to chemicals, to organics. Whatever your preference but container plants need fertilized. You could wait until you see some new green growth but probably not an issue by the size of it. Figs are generally very vigorous except when rooting/establishing cuttings.
Spider mites are active, leave webbing, and are around 1mm so visible with the naked eye if you have good eyes and are under 40. Minor magnification for the rest of us.
Fig mites (Aceria ficus) don't leave webbing, don't move much, are 1/10th the size of a spider mite .1 - .2mm, and difficult to spot even with magnification sometimes. Half the time they just look like a leaf hair. They are a known vector for transmission of FMV.
Both can cause similar leaf damage to FMV which may not necessarily be an issue if minor.
Most will argue that FMV is inevitable and a non-issue.