Any reason why you needed to make this post again?
https://eu.forums.blizzard.com/en/wow/t/please-make-veteran-of-the-fourth-war-accountwide/
Just repeat topics can be considered Spam and are against Code of Conduct.
Although I support you in your quest to get this title to be account-wide. You’re more likely to get a response from Blizzard if you use the In-Game feedback in the Support tab, than making posts on the game forums.
But as Aspie suggests. You might need to wait a while before it happens.