How to get people to support your charity enterprise in its earliest stages?

Hi, I'm trying to develop my own social impact enterprise for ecosystem restoration, but have a difficult time to get people into supporting it.

I've tried contacting various organizations, companies, individuals, and networking on different platforms, but without much result. Although I have been promised business contracts, contacts, promotion, or direct contributions, no one went through with those, and it ended in ghosting in most cases. people mostly don't give a crap or already support other projects.

Do you have any advice on how to approach this and get unstuck? Maybe some of you could refer some useful contacts? Are there maybe some influencers who would be open for collaboration to spread the word about my project?