If I only had three wishes, I would still spend one of them on having enough sense to make good wishes. I’d probably do that if I only had two wishes.
I might even use my only wish on having significantly better sense. My current situation isn’t desperate—if I only had one wish and were desperate, the best choice might well be to use the wish on dealing with the desperate circumstance as thoroughly as possible.
If I only had three wishes, I would still spend one of them on having enough sense to make good wishes. I’d probably do that if I only had two wishes.
I might even use my only wish on having significantly better sense. My current situation isn’t desperate—if I only had one wish and were desperate, the best choice might well be to use the wish on dealing with the desperate circumstance as thoroughly as possible.