I found a baby starling and i can't put it back in its nest!?

the tree is too tall and i can't even see a nest from the ground. it is a fledgling. i am feeding it kaytee exact bird food with a syringe several times a day and it is in a cage. it can't fly it is still fuzzy. i thought of putting it in a nearby bush put i don't know if the parents will find it, it gets down to 38 at night and there are a lot of stray cats. i thought about making a fake nest but i dont know if the parents will go back to the fake nest. i found it behind a car tire so i cant just put it back where i found it. think it'll be ok if i keep feeding it until it learns to fly and i can set it free? any other good ideas? also it has mites (ewww) i sprinkled apple cider vinegar, lavander oil, and tea tree oil on the bedding and it killed the mites in the bedding but not the bird. what would you recommend? o ya and spca doens't want any wild birds....