You've grown into a competent beginner Pirate, I see. But this is just the beginning.

Would you like to receive additional training?

Good choice.
You will see Muirhat when you exit through the door. Go see him.
He will have some training courses prepared for you.

No good will come your way if you decline.

Has Kyrin sent you? I've been waiting.

But it's not like I'll ask you to do something absurdly difficult.
Don't worry.

Muirhat is in Nautilus.