We are having a few problems with Luna who is now 6 months old with her biting, whenever she doesn't want to do something she jumps and bites at hands ect, when we do any training she will try it then and lots of other times, any good advice as the biting is getting harder .
Welcome to you. Yes, this happened a lot with Mollie. Even up to eight months old. Keep up the ignoring, keeping hands out of the way and turning your back. Calm praise and a short training session to reward good behaviour. Here is an excellent article - https://www.thelabradorsite.com/excited-puppy/ This excited/frustrated behaviour gets worse before it gets better, but it does get better.
Abner did that too! Just ignore her. Sometimes in the morning we had to shut ourself in the bathroom with him outside for 30 seconds to calm him down. He eventually grew out of it...
I changed this behavior by asking Finn to get his cuddle. He went to collect it and his behavior changed.