Excel with the list of URLs to which you have to do the link blast. distribute the 400,000 links equally.
Excel in total has 152 urls, so each URL would come out to 2631 links/url.
You can do that from Options >> How to submit /verify
https://prnt.sc/26fam1k
Keywords
use a list of generic keywords in English.
use platforms of the following type: Articles, Comments , Guestbooks
Avoid using: Redirects, Joomla K2 Pingbacks Tracbacks Wikis Indexers
To be able to do all specified details other will not be accepted