My fig tree has figs that will not ripen. What can I do to make fruit

How old is your tree? I have a lot of figs growing near my building, and I think it may take quite a few years till they can really bear fruit.

Goggle fig wasp. A certain insect is needed for pollination.

https://www.gardeningknowhow.com/edible/fruits/figs/figs-not-getting-ripe.htm

Pick them before birds or bugs ruin them, ripen indoors, or sunroom if you have one. When near ripe refrigerate.

It might need to be crosspolinated- good luck!

When I have figs that do not ripen, I start pulling off some of the leaves. This way the energy from the plant goes into the figs ripening and not into maintaining the leaves. I found this 3 years ago online when I Googled the same question you had. I hot figs that stay small and green for probably 3 weeks with no change and was getting frustrated. I would strip 2/3 of the leaves off of my tree. I didn't do it all in one day. I did it over the course of about a week. And the figs grew so fast and ripened very quickly. Even by taking 2/3 of the leaves off the tree, there were still so many leaves on there