Easy answer. You need a reconstruction. No amount of exercises or muscle building will restore the function of the ACL although truth be told meither will a reconstruction. The main function of the ACL is not to actively or physically prevent instability or giving way. It functions as a receptor to relay tonthe brain what is join on (speed, acceleraton, tension etc) to the brain so that the brain can then fire the muscles to stabilize the knee. Once it's gone you will not have that feedback again. So what to do? Firstly you efforts thus far are not in vein as you needed to do those in anycase. But you also need to do a lot or proprioceptive drills, e.g. side-stepping, lunging (all the movements typical of netball) before you return to netball. This is as the brain needs to learn to use other receptors to take the place of the ACL. That is not automatic so you need to work at it and work at it for months rather than weeks.

Now to add to that you need a recon. That is if you wish to continue netball. If you don't it is my opinion you are at a greater risk of further damage to the Wikipedia reference-linkmeniscus and joint surfaces. An increase in joint laxity and rotatory instability also makes you at anigher risk of patella dislocation.