"To get things into perspective" basically means to put things in order of their actual importance, or to bring something to light. If somebody was spending their money on toys instead of bills, somebody might tell them that they need to put things into perspective. Because they need to look at their actions and realize that they spending their money poorly.

https://en.wiktionary.org/wiki/put_something_into_perspective says: To compare with something similar to give a clearer, more accurate idea. "You can put your worries into perspective when you realise how many people in the world are so much worse off than you."