Not as good 2nd time
Statistically, re-do ACL surgery does not have as good results as the first surgery.
If your surgeon can find a problem with the way it was done the first time, such as non-ideal bone tunnel position, and the problem can be fixed, it may do better the second time. The decision to have a second ACL surgery is a complex issue. It would be reasonable to get at least 2 opinions prior to repeat surgery.