In the vine teaching, what did Jesus say the one who remains in him will do?

Answer: Bear much fruit

Jesus said, 'The one who remains in Me, and I in him, will bear much fruit. For apart from Me you can do nothing.'

“I am the vine and you are the branches. The one who remains in Me, and I in him, will bear much fruit. For apart from Me you can do nothing.”— John 15:5 (BSB)