Email search

Hello guys I have one issue I want to find emails of high position people from specific companies , the problem I am facing is that I cant find so much even though they exist , current tools I'm using :
1. dux soup
2. mail hunter
The answer I'm looking is there way go deeper?

Manually search them or find a service for this one theres a ton of options to get this done

You can try purchasing 'lists' from companies that sell company information like emails and addresses. It'll be the quickest way to get a large amount of email addresses that point to important people. Some of these companies will promise that the information you buy will work and that they've tested them. I don't 100% believe them but the good companies should offer some sort of compensation if you can prove something doesn't work.