Delegate responsibilities, not tasks.
People way to often focus on what should be done, forgetting who actually will do those things. Giving full responsibilities is the key to having a well-working organization. And because everyone has to be aligned, during planning, you must take into account the people who will take full responsibility for it.
Make a list of responsibilities you could delegate.
Make a list of people who could take the responsibilities.
When you give the full responsibility, define standards and make the person his own boss. Don’t supervise him.