Advanced SEO are extra steps you do in order to have specific success with some keywords that you want to be found on.
The aim is that all these words will be ranked number 1, and almost always be found by Google.

1) It starts of that for each keyword you want to be found create a seperate page, repeat they keyword and it's synonyms in the main title, the header and in the regular text.  make sure you have enough content relevant to the keyword.  Add certainly a picture of the keyword and make sure your image name is the same as the keyword, it also needs to be in the description of the image, add extra SEO tags

2) use SEO software embedded in the website, so you can weekly follow up the score and alternate accordingly

3) analyse your 5 main competitor websites and use their keywords

4) create backlinks to the relevant pages from other quality websites and social media

5) make an overview page of the keywords with links, make sure this is in the menu clickable (= indexable)

The reason why it can take a few months is that Google algorithms have become smart.