Please, please, don't use impact as a verb. Be very careful of using jargon. Jargon is the shorthand that professionals in a field use to communicate with each other conveniently. It is almost never useful in proposals. Don't hog the credit.
Most successful organizations accomplish what they do in collaboration with others.
Don't say you hosted a conference or developed a policy recommendation if you didn't do it alone. If you did it in concert with other organizations, share the credit. It gives your organization context and a feeling of clout and effectiveness. Here is a tip on presentation. Everything you send to a foundation probably ends up in a standard-issue file folder.