Come out of (one's) shell American informal
They use the image "snail" or "shellfish" because they have the shells to protect them.
To overcome the shyness or unconfidence to show oneself or to become sociable
A new job is so good because it can help her to come out of her shell.
When we are enough 18 years , we have to come out of our shell and step out of our comfort zone.
The verb "come" should be conjugated according to its tense.
The source said that It is written by Ebenezer Brewer in The Ancient Sage, 1885.
If you swallow the bait, you take something that someone offers you, or agree to do something that someone asks you to do without knowing that it is a trick or way of getting something from you.
You can't just do whatever he wants you to do. Don't swallow the bait.