Isometric shooter - Bullets

So, I'm having the exact same problem as this guy is having https://answers.unity.com/questions/1482219/shooting-a-projectile-with-isometric-view.html

My scripts works the same way, a ray cast in order to know position of cursor, create a bullet, add angle, move it forward. I'm working with a 3d scenario, with a fixed camera on top for the isometric effect.

I know that the bullet might be going, not exactly where my cursor is, but in a direct path between the cursor, the Y axis, and the Y value the bullet has.

This is what my script looks like.

 public void ShootingToClick(RaycastHit dest)    {
         Bullet newBullet = new Bullet(Instantiate(BulletProperties), dest, System.DateTime.Now);
         newBullet.GO.transform.position = this.transform.position + new Vector3(0, this.transform.localScale.y / 2, 0);
      
         newBullet.GO.transform.LookAt(new Vector3(dest.point.x, newBullet.GO.transform.position.y, dest.point.z));
         Bullets.Add(newBullet);       
     }
 Update has
 B.GO.transform.position += B.GO.transform.forward * BulletSpeed;

If I erase the Y axis, and leave it as it comes from dest then it works explendid, but, the bullet also goes up and down and its not what I want to happen.

Same pics the other dude posted:

Dont really know how to fix it, tried working with a target but its really confusing to shot like this.