It is possible the damage is from aphids, they have been very bad this year around here and are on plants (like figs) that they usually leave alone. You can look for them on the undersides or shaded areas of the newest leaves. What i have seen mostly is deformation from aphids, but also a little chlorotic spotting. I expect natural predators to take care of them before long, the symptoms on my plants have been decreasing. But your symptoms seem to be newer, the lower leaves I see don't have spots.
If it is from fig bud mites the symptoms will get worse as their population increases. You cannot see them with the naked eye, and even with a 40x lighted microscope they are hard to spot because they also infest new leaves and buds mostly and those young leaves are densely covered with plant hairs, not to mention how long it takes to look at a whole leaf a fraction of an inch at a time. A key indicator of fig bud mites is the spread of chlorotic symptoms from branch to branch, plant to plant on new leaves.
So if not worrying about it does not work you can try miticides, or just wait until winter and let the cold kill them. With only one plant there is no danger of spreading virus to the plant, it already has it or it doesn't. When plants are infected by FMV by mites, rather than grown from a sick cutting, the growths from the roots usually show no symptoms because the mites do not infest the below ground parts. So if your tree wakes up sick next year (the way it happened for me) just chop it to the ground and know you did it a favor.
Your tree is planted in the ground, unless you have very sandy soil or some other issue you should not need to fertilize. If the weeds grow well in that spot the fig will do fine. Too much growth and it will never ever become winter hardy.