If you want to use your compost, it's best to have multiple piles. An active pile, and a cooking pile.
It should only take a few months to turn food scraps and carbon into finished compost. Turn weekly, spray will AACT while you turn.
Once you have a pile 3x3x3, cover it will peat moss or coco, and let it cook.
If you keep adding to it, it will never be finished.