Is the repeated collision of crows with me a mere coincidence or a message from God? If it is a message, does it indicate good, evil, or a trial? And is there a sin upon me that requires atonement? What is the interpretation of these events?

What the questioner mentioned is an ordinary matter that should not be a cause for pessimism, as it is among the customs of the pre-Islamic era (Jahiliyyah). The Istikhara prayer does not rely on dreams, but rather on what becomes easy thereafter. The questioner is advised not to preoccupy himself with the matter of crows, but rather to focus on strengthening his faith and his knowledge of Allah and His decree, and to deepen his belief in divine decree and destiny. He should know that what has befallen him could not have missed him. He should strive to correct his path towards Allah through seeking forgiveness and sincere repentance, and work to replace bad deeds with good ones, and adhere to piety towards Allah. For whoever fears Allah, Allah will take care of him and protect him. Adherence to Allah's command rectifies a servant's affairs, and he should persistently supplicate to Allah.