Engage Plant Management and keep safety top of mind
Ask them to make safety a higher priority on their agenda and invite them to safety meetings on a regular basis. Also privately share tips from the anonymous suggestion box you plan to act on and introduce them to key employees who are fostering the culture of safety you wish to spread. This way they can see these positive works in action.
Be Pro-Active at Plant Management Meetings
Ask the plant manager to make safety a larger part of the regular plant communication meetings. Utilize these 10-15 minute sessions not to focus on safety statistics, but to highlight what you are doing to strengthen the culture of safety within your organization, remind people of procedures, etc.