What happens to a person who commits suicide after they take their own life? Do they reincarnate or cease to exist forever?

I am an 18-year-old struggling with a deep sense of emptiness and exhaustion. While I have a strong desire to improve myself—to grow mentally, physically, and spiritually—I am constantly weighed down by a heavy sense of fatigue, melancholy, and lack of motivation. Every time I try to focus on...