Help! cold email funnel not producing any results

Hello!
We're a cybersecurity company, solving a sticky problem for B2C companies once they hit some size (100K+ users).
Our main selling point is that we can put an and to certain cyber attacks immediately, which is why we're trying to reach out to potential clients when they experience those attacks.

I've been working on a cold email funnel for the past few weeks, with no results - not even a single reply to our emails.

1. We're reaching out to hundreds of people with relevant roles at relevant companies.
2. Our ask is pretty simple - point us to the relevant person in your company.
3. We're using a email sequence, usually 4 emails before giving up.

So far we've seen OK-ish open rates (10-15%), but not a single reply. Any words of wisdom to help me out?

(P.S. - here's our site https://www.floodgatesecurity.com)