How to Build Outreach Links (Find Emails of Site Owners)

I am starting with Outreach link building, My writers can create awesome content I believe i can do out reach, however, the problem is "How to find emails of site owner".

Like I can build awesome content, find people who have linked to worst pages or will want to link to my page and then send them an email asking > send an email asking again > send an email asking again (If needed).

However, the thing is "how do you guys find the emails of the site owner, like do you use tools like…

How to Build Outreach Links (Find Emails of Site Owners)