I have wrongly accused an innocent person many years ago of stealing while knowing the truth. Although I feel bad about it I can't reach him now due to the passage of time. How can I repent?
You need to keep on searching to reach him and seek pardon from him. If you lose hope of reaching him, you need to seek from Allah (SW) to forgive your and his sins. Whenever you remember the victim, you should sincerely pray for his forgiveness.
Wassalam.