Cold emails. yeah, I've replied to a few, but only when they actually show they've done their homework.
most are just spray-and-pray nonsense: "I can get you 10x traffic" with zero mention of my actual stack (Google Tag Manager, GA4, Screaming Frog workflows). if someone mentions a specific problem I've actually posted about or references a tag implementation quirk I debugged, that gets my attention.
A good cold email is basically an audit pitch disguised as a conversation starter. the bad ones read like they scraped my LinkedIn title and mashed it into a Mailchimp template. i've even had a few that tried to sell me "GTM migration services" - ironic, since I do that for a living.
One trick I've noticed: the ones that include a concrete, non-generic insight about my site's tracking setup (e.g., "noticed your dataLayer push on checkout fires twice") get a reply every time. Everything else goes straight to spam