How do I find startups that are looking for a dev? How to approach them?

I have been trying platforms such as Work at a Startup, Wellfound, LinkedIn, and other job boards, but not much of remote hiring(outside US). Nothing on hiring thread as well.

I have been working with react, next.js , react native and node.js from last 4 years and more. I wanna to join an early-stage startup, contribute closely to the product, and learn more about a startup.

Whenever I find an interesting startup, I usually reach out through email or Discord. Most of the time, they are either not hiring, do not have the budget, or do not reply. I have also tried approaching founders with specific suggestions about how I could improve or help build their website or product but no luck.

I have the flexibility to take some risk so idm working on contract, freelance type. I just wanna have try something like this.

Do you have any suggestions?