individual SEO master ( Not agency )

Hello, i have a wordpress website. my website has a good rank on Google, im already in the first page on Google, but im searching to make it better, so i need from u the steps and suggestion
at first i need:
1. Website Analyse and sreaching for problems
2. Backlinks
3. Domain Rating
4. some Keywords are in the third postion in Google ( i need to know how to make it on the first postion)

can you do this steps or more?
How long will you need to finish?
Bid with "individual SEO master"

Thanks