Learn to be a cheerleader for your department. Build enthusiasm in your department as a valued member of the organization's team. Be quick to point out success and lessons learned from mistakes. For example, give a bonus to someone who made a mistake but was able to correct the situation and add value at the same time. Most important, prove that you care.
Decision support needs to evolve from a necessary evil to a partnering activity.
Challenge all your staff to interface with your internal clients as business partners. Do so by understanding their business, sharing insight, and seeking value, even if your clients do not request such dedication. Nothing breeds more solid relationships than a partner who cares. Don't wait for the next request to find out how the previous request ultimately affected the organization. Informal conversations well after the output is used can help you determine if the client believes your efforts added value overall.