Many souls take in the negativity of the world without overspilling it to others. When they do so, they hold the negative energy in escrow. They emit only positive energy to others despite absorbing negative energy of others. This creates a small lop-sidedness in the otherwise equal balance of positive and negative in the outer world which influences the trajectory for the entire world to move towards a net positive. With time, this small shift of scales eventually brings in the golden age for all of mankind. These sacrificing souls do the trick for all of humanity.
Then there is the one who dies on the cross and becomes the lamb for God so that redemption becomes possible for all even if in the distant future.
Then there are the light-workers who absorb the various strong light codes from the cosmos and ground it to the Earth for the upliftment of Mother Earth and entire human race at the expense of their own health and happiness.
Then there are the wrong types of sacrifices, most commonly seen in the domain of relationships.
When one puts up with people who don’t know how to love them back in the right way, one is making a wrong kind of sacrifice.