Every soul comes with its own mission
A soul that returns to the world does not start from scratch but comes to complete what it still lacks, which explains our particular pulls and tests.
The Arizal explains that a soul coming into the world for the first time must keep all 613 mitzvos. A soul that returns in a gilgul does not start over. It must complete only the mitzvos it lacks, those it did not fulfill in its earlier life. He uses this to explain a puzzle in the Talmud: why one sage was especially careful about one mitzvah and another sage about a different one, and why each chose different middos to guard. Each was repairing what was missing from his earlier life. Seen this way, our own pulls toward particular mitzvos need not feel random. They may point to the repair our soul has come to make.
Source: Sha'ar HaGilgulim, Hakdamah 16
Think of the area in which you are tested most often: your temper, your tongue, your time. Instead of asking why it keeps happening, ask what small step toward repair you could take today. Choose one concrete action, such as pausing before a reply or setting a fixed time to learn, and do it just once. You are not behind. The Arizal teaches that this very challenge is the job your soul was sent to do, and each small success counts.