how do i rank for my second keyword?

hello
i have my blog main keyword on position 1, but now i want to rank for the second keyword,i have been trying buiding backlinks for second keyword for the last 4 weeks but is nothing coming up on 1000 serp how do i do it...?
thanks

There might be high competition for your second keyword. Just keep on building links you will surely see your ranking.

thanks

in my experience, it really works best to only target one keyword per page of your site. instead of trying to combine multiple keywords into one article, write one article for every keyword that you want to target, optimize the article for only that keyword, and build backlinks to the article using only that keyword as anchor text. this has worked better for me than going for multiple keywords with only one article