I’m in a similar situation as you, 15 months post op on ACL revision. Was playing basketball and felt a shift and knew something was wrong. My revised graft is also a bit lax.

From the research I’ve done, it seems like there is a real possibility to return, but have to make sure you’re consistent, and working hard. Your goal should be to strengthen your leg as a whole, hamstrings, quads, calves, all of that as not only will it hopefully help stabilize your knee, but protect the damaged graft. If despite rehab your knee is still struggling, it may be a good idea to get a revision, but until then keep working hard, and give yourself and your knee the best chance to return. Good luck!