We should try to help "the less fortunate". The phrase "the less fortunate" refers to people who are in a difficult or disadvantaged situation, often due to poverty or other challenges. The phrase is used to express empathy and a desire to help people who are struggling or facing difficulties in their lives. The use of "the" before "less fortunate" implies that this group of people is being considered as a whole, and that the speaker wants to help all of them collectively.