Stay committed and post regular reports on your progress.
Be honest and transparent. Inform the community about potential delays or problems that you encountered.
Show deliverables, results or any other relevant success metrics periodically.
Create the final report and and link it on existing proposal pages.
Stay engaged with the community. Try to answer all the questions and address all the concerns before finishing the project.
Close discussion and enjoy the success. Grow your reputation. Use it as a reference on your future proposal.