Annie...if I ever travel your way, I'll bring you a singer. I only have 8 males and four females left. I'd like to sell my females, but we aren't selling any more males.
Yes, Spike should eventually start singing again. However, I do have a male that never started singing after his first moult until I moved him into our outside aviary, and then he started singing again, about 5 years after he stopped.
I would recommed that you put his cage in an area where he can get the maximum amount of sunlight daily, give him plenty of fresh green leafy things to eat, along with mashed boiled egg, mostly yolk, slices of fresh apple and cucumbers. Be sure you take out any uneaten egg aften two hours. Give him the opportunity to bathe daily.
Hope he finds his voice soon. di