I want just to get some advice on bitcoin investors. do they exist? how can I find them?
Yes, they do exist. There are lots of investors here in this forum.
can they invest in real world project not just invest in online projects.
Yes, they can also invest in a real-world project it just depends on what type of investment or project that is?
What I see here is that the reason you failed in your project is that, the investor doesn't find any profit to your projects. If your project can be profitable then you will not be having a hard time finding investors.