Cold mail for networking with ADs

Hi, I've been wondering if sending cold mails would actually work for networking with ADs. Right now my network is really poor, I've experience as AD on student films and as spark on bigger sets (adv and music). I want to focus on my AD career and I would like to collaborate with ADs to improve myself, make experience and expand my network.

What a good cold mail should have in it? I know that the chance of getting a reply are really low, but I want to try it anyway.