Each launched project is a learning experience, so if you're planning to relaunch a project that wasn't successful in reaching it's goal, just make sure you've taken stock of what worked and what didn't. Here are some common points that creators usually reexamine:
Your project's goal and budget. Does your funding goal align with the minimum amount of funds that you need to complete your project? Did you explain what the funds will go towards in your description?
Your audience. Did you let your fans know about your project? Connect with potentially supportive local and social media groups.
Your promotion plan. How did you approach reaching out to potential supporters and the press? Which efforts worked and which didn't?