Hi Jeanese
Just wanted to say hang in there. Your story is so similar to ours! We adopted Eddie just over a year ago now and he too had been cooped in his cage as his owners had two dogs which they adored. However, Eddie was only two so he hadn't spent that long cooped up but long enough. The first thing he did when we brought him home was bite me so hard I cried! It took me so long to gain the confidence to be near his beak again!
I decided to camp out near Eddies cage. We gave him a couple of weeks to get used to the room then I moved the arm chair right next to his cage. I ate next to him, watched TV near him and made everything look really fun! Bit by bit he got more and more interested and started coming onto his bars to get a closer look. I also opened his doors on an evening, it took him months before he would come out and when he did he just stayed on the top of his cage. He then started to come down for treats and then pets and now he behaves like a little kitty and loves to bed down on the sofa and be stroked. However, he does not like my husband all that much so we're starting the basic training all over again but with hubby so Eddie gets used to him too.
Its been 17 months now since we rehomed Eddie and we're still getting used to each other but you will get there Jeanese. It takes them a long time to realise you are different to the people who treat them badly but they will come round.
best of luck!