As a campaigner it's your responsibility to share the progress of your project online and answer every question your (potential) supporters ask.
You can share your progress by writing updates about what you’re doing, challenges faced and lessons learned. Don't forget to add photos and/or videos. Your supporters are curious about your work, if you keep them updated they will feel connected to your project. Next time you start a crowdfunding campaign they might be the first ones to support again!