A need for control is rarely random. It usually got installed somewhere — a house where things went wrong without warning, a year when the only way through was to hold every detail yourself.
Seen that way it stops being a flaw to be scolded out of. It is an old competence, hired during an emergency and never released afterwards.
Which is why the letting go has to be gentle. You do not sack the thing that once kept you upright. You give it smaller assignments — let someone else book the restaurant, let the report go out at good rather than perfect — and let it discover slowly that nothing collapses.