How to track "stealth-mode" Web3 builds before they hit the mainstream?

I'm doing a deep dive into the infrastructure of early-stage Web3 startups. Specifically, those in the 'stealth' phase or under 100 followers.

My goal is to study their Go-To-Market strategies. I've been using X Pro and Pinksale, but the signal-to-noise ratio is tough. Are there any dev-focused forums, niche Discord incubators, or GitHub tracking methods you guys use to spot builders before they hit the mainstream aggregators?

Not looking for alpha calls, just curious about the tools for data-driven research. Thanks!