Be sure you have the time to do a good job. Do not resubmit the same application because you did not have time to revise it. Build on collaboration with others. Nearly every funder wants proposals which reflect participation by more than one organization. If you develop a collaborative proposal, make sure the final proposal reflects the collaboration, not just the sign-off by another organization.
Genuine collaboration requires investment of effort by all parties.
Do not assume the funder understands the problem or strategy your proposal reflects. Management credibility is essential. Your organization must provide good evidence that you have the skill and experience to implement successfully the plan and account for the funds used. The strongest proposal is the one judged most likely to achieve its goals. Results should be clearly spelled out and, wherever possible, measured.