Will including a video in my email hurt the deliverability?

Hey I'm Starting with my new digital agency I've few years of experience in web designing, graphic designing, marketing, and I've got a team with other services too. And we're starting a new digital agency which offers all the services at one stop! But I wonder since we're in our undergrad still and don't any amount to spend on leads is there any way in which I can get qualified or kinda quality leads for free or any other suggestions for us? And I've started cold mailing and ik it's a long process! Thanks in advance!