Hidden Traffic Sources That Still Work in 2025

Anyone here still using hidden or underrated traffic sources in 2025?

I’ve been testing a few low-noise platforms that are delivering shockingly good results, but I’m curious what others are using that isn’t saturated yet.

Let’s share what’s actually working before it gets mainstream.

Thank You all in advance!

What are those "few low-noise platforms that are delivering shockingly good results," that you found?