As for actual steps you can take: if you only deactivated the account without removing the domain, you can just reactivate the account again.
But you might also just not take any step. What you’re seeing is the result of DNS cache. Some people will already see your website live at the new provider, and you will as well within 72 hours. If you have patience, you’ll see your website soon.
And you may want to see this article on some tips on how to preview your website, or make sure you can see changes faster: