SEO is not a once off activity but rather an ongoing one. If we stop, your rankings might fall and your traffic will decrease.
A 4 – 6 month continued SEO effort is recommended before one can expect positive results, so it is a very time consuming process. It also depends on your industry and how much competition there is, so patience is the virtue here.
We can not guarantee no 1 ranking or consistent top 10 rankings for any keyword phrase as SEO has no control over search engine ranking algorithms and ongoing efforts of competitors
Google may hinder the ranking of new sites until they have proved their ability to exist for a certain amount of time, or until there is enough backlink strength.
New sites may get a temporary boost for some targeted keywords for a short while and then it settles down.
Search engines can also drop rankings for no predictable reason, but they also re-appear again without any extra SEO efforts
Rankings can therefore fluctuate daily because of ongoing changes in the ranking algorithm, SEO efforts of your competitors or both
SEO work can be destroyed if one or more of the following things are changed on your site without the prior consultation of your SEO consultant:
Renaming, relocating, adding or removing any files, folders or sub-domains, bots or any other web documents