Hello, I hope you understand what i'm saying, how to link build every day for a keyword, i am on first page, i've done a lot of diversity, lots of links submitted, i dont have elsewere to submit links. Keyword is medium competition, i ranked fast in top 10. Does submiting links again on the same domains will affect my site?
What kind of sites are you submitting your link to? Directories, press release sites, article submission sites...?
Yes it will help but after a handful of links from each domain it will stop having the same effect. You might be better off looking for new sources for links.
There are literally thousands of places to link to, just make sure they are high quality links from a site with a PR of at least 3.
As already posted submitting links to the same domain will result in little or no affect. One benefit could be direct traffic from submitting the links and someone clicks through (if interested) to your domain/website.
Avoid getting into low ranking sites because that's may just seriously lower your stats. You can also search for other directory sites where you can submit links. Or join other forums like this one for you to have your signature links because that also counts. Or you can also posts in high ranking blogs and submit your links to it. That works well.
It is all about getting the handy links and avoid spammy things for your site. Using your niche and keeping different anchor texts will work in this way.
The things that affect a lot is competition, If you are in top 10 and have high competition on that keyword then you need to create backlink 4 days of a week. but if competition is low on that keyword you have put less effort on that means 2 working days of week that much only.
This is what you can do for using the same list of web places where you have built your former links: one- write and publish some article who links to your blog or site and build links to the article, and second-add new pages to your blog or web page and build backlinks from the same places to the subpages of your site, this time you can use new keywords for link building, so your page or blog will rank for a bigger list of keywords. Try to find keywords who receive a big quantity of monthly searches. You can use Google adword keyword tool (just do this search into google and visit this place to find those useful keywords).
Link building is one of the most useful practice for SEO. Yes, linking again on same domains will affect only when the links posted are too much. 2-3 links in the same domain are fine but over stuffing is bad.