Another approach to treating imbalances like this is to always start with the weak side for unilateral work and let whatever the weak side does set how may reps you do with the strong side.
So say you did split squats or some other 1 legged exercise. Start with the weak leg (left in yoru case). If you only get 5 reps with that leg, stop at 5 reps on the right, even if you could do far more.
Of course, since your rep count for pistols is currently zero, you will need to pick a less intensive exercise at first.
doing extra volume for the weak side is also a good idea. I seem to recall seeing a 3:1 ratio of weak:strong as a volume recommendation but I couldn’t tell if you if that’s based on anything except the opinion of whereve I read it.
Lyle