improve rank with sending traffic!!

Hello friends, a guy who is active in the field of SEO told me that one of the links of my site, which is on the second google page, can bring it to the first three links in a few days, and he says that he does not do this with links, but by sending traffic. It is done on the site. Does anyone know how to do this?

what can i say is that i get 3500 visitor on one page this month and it still not indexed

Do not believe him