Hi Janeth,
The competing webpages that I'm squashed in the middle of this term for are Whois and Nominet, and the search term is 'find a domain name'. As I mentioned there are dozens of factors involved in doing onsite correctly and the rules haven't changed much in 10 years. Some of what's on the page that looks big hitting doesn't actually count for much, and some of what does count is quite nuanced.
Of course I understand that inbound link text is what counts when it comes to link building, but I have serious doubts that Whois and Nominet are not getting volumes of relevant inbound links with the phrase 'domain name' in there somewhere.
I realise that I have a lot of content on this page and that this is helping also. However, in instances when I do onsite for clients and they won't let me touch much of the content, the norm is to move up from page 10 or 8ish to page 2 to 3 ish on the back of the onsite work which is done before link building commences. Where the term is more competitive we might not move that far up but we always move.