HubSpot's Sidekick (www.shaunnestor.com/recommends/sidekick <-- affiliate link, otherwise, www.getsidekick.com) and their CRM work with each other to identify this kind of data. I'd be happy to work with you and show you how to use them. All the best, -Shaun
Firstly - it is not always about spending a fortune on marketing and advertising. It is more about laws of physics than math. If you can put enough force into things that all increase the energy of that force - meaning, doing less isolated efforts of marketing but more integrated approach. Look ...
The steps are the easy part. It's the execution. You can put together a great lead gen machine using content, cookies, and email marketing.
Coming from the buy-side, I'm sure I have a different spin than those sales & marketing gurus who I'm sure will be keen to help you & comment shortly. You're lucky because there are SO many avenues these days. However it is hard to keep on top of them all and there's no one stop shop currently....
I recommend using a cold emailing marketing solution like mailshake, woodpecker, etc.