I think 300k is hard to match in the remaining days. Usually KS campaigns go hot early and then cool down rapidly.
almost 70% of pledges to KS happen in the first 5 days and the last 3 days of the project, regardless of the length of the project. This is why, when I'm asked to consult, I always say keep your project to 30 days. The success will always be your understanding of you target audience and your understanding of social media. There will be a huge surge during the last week as the KS reminders system kicks in but if your worried then start posting on any cyberpunk, sci fi, gaming, RPG, or other website and talk up the project. Always try to include a direct link so people only need click and not do any searching on their own.