Based on the project concept.
There are projects that want to apply the idea of using crypto even I found it not suitable or let's say doesn't make sense (according to my view). It's not easy to attract investors on a project that can be consider as "cross bordering" between real world and crypto or I don't know if this the right term to this.
If you are really eager to attract more investors or some sponsors for funding, think outside the box what will be the good reason why should someone will put money on your project. No way they will just throw money on a something that will not have a promising return (remember, "investors").
I can't really tell you what's are the exact things to be done because you know your project more than us. Goodluck having a brainstorming on what things you should do. Patience mate.
I also agree that the main reason for attracting investors is the ideal concept of your project. If this is an innovative and interesting idea that will help people or solve their problems, investors will be definitely found.