What the - SERP?
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I have my site I made 5 days ago with 5 pages of unique content at 500 words each, no backlinks, and non-optimized on page SEO.
I just check my SERP ranking for a competition of 49-50% at I am sitting at the bottom of page 1?
Will I keep this rank or what?
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This could be influenced by other factors. Are you logged in to Google, are you visiting the site in private browsing mode etc?
If you've visited the site a few times, Google will take this in to account and push your page higher up the SERPs for searches conducted by you.
Hard to tell if you will keep the ranking without knowing any more information?
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Sorry to disappoint you but look to me lately that Google show new sites up (same with new maps) for few days and then they drop to their natural position.
i was coming across this few weeks ago with one of my customers projects and seance then i am checking it and see most sites show up there for few days and drop down.
hope it will stay up for you

Mike
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I've seen something similar especially when you appear in some kind of news websites.
Maybe Google wants to see if his new page is no something 'viral'.
Cornel
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Are you using wordpress or some kind of blog CMS? I have seen my posts shoot up the SERPS almost immediately after I post and then slowly over a few days creep back down and unless they start getting socially shared or linked to fall off the front pages. It's to do with how Google counts fresh content.
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No its just a regular micro niche site focused on one thing with posts that are relatively old.
Nothing out of the ordinary; I should expect a drop then.