I want to know that what is the best way to approach investor so he may be affected by your idea and invest.
Read this post - The Best Ways to Approach a VC
Apart from this I am sure many investors also browse Startups Forum frequently. Fill your complete profile - your profile pic, bio and city, also actively participate in discussions.
This will help you to network better with other people here and help you to build identity and trust.
You can also post about funding here - https://startupsforum.in/c/startup-funding