The thing to be aware of is that 'Google' has been in the habit of changing the search and index algorithms every so often. This can result in in your ranking position changing (significantly) from being on the front page to 'nowhere'! When this last happened there was an outcry on some of the Google fora?.
I would also guess that if you have paid for a one off SEO fee it all needs doing again! (more money).
The 'country specific Googles' all appear to work from different sub-databases that do not update at the same time.
Be careful about using tricks that can result in you becoming blacklisted eg over seeding with relevant words, white letter on white background or similar. At one time the best thing was to have as many cross links as possible.
PS things may have changed now , my experiences are from about 2 years ago.
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