I will quote my knowledge on my friend's ringneck and some of the things I research snd read about, if you did not seek the ring on your bird neck and he's around a year and a half then maybe it is a girl, and females are known as much difficult to talk and copy, but if you are sure he's a male in any way, then do not worry or be afraid, ringneck is a wonderful parrot talker and loves to talk a lot and as much, I recommend you to teach him each word in a different situation, for example, if you want to give him a treat say thank you to him, and if you see him bored or just ser ask him what are you doing. Ringneck ( as what I read and see) do NEVER say anything unless there's a reason for it, or it is something like a routine, my friend had this beautiful ringneck bird for almost 7 years now, and from what I'm known of he does actually have a much lot more vocabulary than he shows, but he just like to say a thing in its situation and not randomly, but if your parrot does this sometimes it is actually okay, better even, anyway, also some of the ringnecks start to speak after two years old, do it is fine if he did not, with what you say about giving him much attention I'm sure he would talk much sooner, he's definitely a lucky bird, and he will someday for sure talk, I hope I helped you with my little knowledge i do have, which im sure you already knew, but at last some of it will help.
and welcome to the avenue, Kristy!