How best to utilise 300k emails and phone numbers for growth hacking

So our startup is in the space of data and ML. And part of getting the data is using scrapers to pull information from a certain big website, this website has a large amount of exposed emails, phone numbers and addresses publicly that I found hidden in the DOM when going through what to scrape. All of these are within our target market but obviously not all of them are the beachhead customers. I can make the cold emails extremely personalized due to the information we have on them, same for the phone calls How best would you utilise this? Would you test a campaign on a portion of the emails to make sure you don't get marked as spam? Would you use an AI voice caller? Etc etc Any thoughts on best way to utilise it?