how to rank fast for high compitative keywords?

Lay the Groundwork.
Do Your Initial Keyword Research.
Check Out the Competition.
Consider Intent.
Conceptualize the Content.
Execute.
Optimize for Your Keyword.
Publish.

since you cant link build too fast without getting punished, best bet is buy some powerful expired domains and do 301 on those existing backlinks to become the authority

For rank faster Do a keyword search to identify the most important keywords, you have to have a clear goal that you keep in mind as you create and publish the content. Find Related Searches, your main keyword should appear first or at the beginning of your title or headline, Publish and Promote in the keyword

First you need to create unique & lengthy content and build some high quality & high authority back links to your site. Use high level keywords to your sites main page and title and meta description and etc. Find out your competitor and grab some ideas.