No need to do anything unless you really want to. When you repot the plant, just change the planting angle so the apex is roughly immediately over the point at which the main stem exits the soil. All done.

If you want to correct by pinching, pinch the leader back to a leaf on the same side of the plant as the direction you want the plant to grow.

This ficus branch has had the leader pinched. The result can be seen in all the new branches that are forming in the leaf axils (crotches).

Same branch ^^^, but I have removed the leaves with branches growing in their axils. There's a reason for that, but it's not related to this particular topic. If I want the main stem to grow to the right, I prune immediately above a leaf or branch that is growing in that direction or is on that side of the trunk. As long as your plant is living, you can be 100% certain a branch will grow in the axil of the tallest leaf on the branch ...... of any apically dominant plant, and Ficus is very apically dominant.
As this is pruned, the new branch in the axil of the top leaf will grow to the right. Prune just above the lower leaf on the left, and a new branch will grow in that leaf axil and it will grow left. That's basic directional pruning. Normally, you would use it to chance the direction of a branch so it's growing toward a spot where it will get the best light, but it's used repeatedly by bonsai practitioners to add movement (zig-zags) to branches and trunks, and to correct the direction a branch is headed. I pruned about 10 bonsai today and I'm sure I made at least 250 pruning cuts based on directional considerations.

Al