Depends on your hashkafa. Everyone is meant to serve Hashem, and part of each Jew’s purpose is to study Torah and fulfill mitzvos (including such “spiritual” mitzvos as loving and fearing G-d, and trusting in Him). But chassidic and kabbalistic thought teaches that each person has a particular soul correction they are also meant to achieve in this life. If a person has a strong interest in a particular mitzvah or good deed, whether it is tefillin or feeding the hungry or achieving worthwhile goals in public policy, it is possible that their life’s mission is to concentrate on that to some extent. Or if a person has a particular weakness, such as a tendency to commit a certain kind of sin or a negative character trait, then part of their purpose in life is probably to correct this behavioral pattern.
Each group within Yiddishkeit has different emphasis, leading to a different vision of what is our life’s purpose. For example, if you read the works of R’ Shalom Arush you will get a sense that attaining emunah and bitachon, and thus true happiness and character refinement, especially through hitbodedut (personal prayer in one’s own words) is one of the main purposes we should all be striving towards.