I have two Blue Crowns. Both of them were several years old when they came to me. Tootsie, the one I have had the longest, is mainly a gentle bird with her beak though she still will nip occasionally. She has this behavior where she will raise up then bring her beak quickly down to tap my hand. She will do this several times and will usually end up with a nip. When she does nip, I make a "protest" noise similar to what she does if I happen to nip a blood feather and it hurts her. Seems to work well.
Rosa and I are still getting used to each other. She has only been with me a couple of months now and was very hand shy. Her nipping was more fearful and aggressive but we have been making progress. I've had to take a bit stronger approach with her nipping and it seems to work well though I don't like being so dominant with her. When she nips, usually I will put my hand above her and cup it over her back and head sternly telling her to "Stop it!" She has gotten the message and now is more careful with her beak. Most of the time. And I think that has led to her being reluctant to bite and that progressed to her being willing to learn "step up" so we are certainly making progress.
It sounds like your BCC is exploring and learning about you with the bites. If you react in a way that conveys that the bite is unwelcome and painful the bird will learn. Just don't overreact. Then it becomes a game. Our birds watch us as much or more than we watch them. And at such a young age you can expect the bird to use it's beak and tongue to explore quite a lot. But time and patience and understanding will go a long way.
Blue Crowns are fun little critters. Hope you have long life and love with yours!