i have a website that update daily with full of short post because there is no what to add.. my website rank fast , the problem is when ged indexed i appear high on first page, but when the 2-5 hours pass, my competitors change my place and i get down. i tried kinds of seo, what i notices that link-building is best (?) . when i pay someone for wrtie for me 800 words on high rank website and link to mine - mt results better ? there is more kinds of seo that can help me or only link building all the time ?