Crowdfunding is a result. It's not a process, skill, science or art. All of what goes into gaining that result may be: marketing, PR, social media, tech, staffing, accounting, law, etc. I say this so you'll identify which provider of those services will do better than you what it takes to get the result. Some have posted correctly that the crowd backs you and that you can (and should) do some of the above yourself. We learned that freeing the entrepreneur to do what entrepreneurs do best; get people excited and as committed as the entrepreneur to the success of the venture is what's important.
If you can focus your efforts on getting just 150 people who are as committed to the success of your venture as you are, you have a tribe. From that tribe you'll get money (hopefully 30% pledged before your campaign even has a website), talent, ideas and connections. With those, any consultant in the above pursuits will be able to get your tribe of people you know to become a crowd of people you don't, all rallying behind your venture, realizing it, sustaining it, and growing it into more than you imagine. Isn't that the reason you're doing this?