Pode ser preciso - this on it's own means "it may be necessary"?
Surely. Or "it might be necessary/needed"
What other ways have you tought about?
Is 'preciso' an adjective here? Up to now I've only seen it as a form of the verb 'precisar.'
Is this the Duolingo portuguese ointment? You apply it and you start talking?
It might also mean "it could be necessary"
So "mais de uma vez" means "more than once". Then how would one say "one more time"?
Mais uma vez
Does the "DE" need to be in that spot?
Mais uma vez = once more