Hello,
I completely understand your requirement and can provide you with best results of required keywords and that too without using any black hat technique.
The strategy I'll use will mainly involve the competition analysis of keywords and then target the focus areas - geographical as well as on interest basis. The first step will be to make the onpage optimization perfect like I'll list out the errors in the website, meta tags etc that mainly effect the ranking and after that I'll start doing offpage SEO that will include tasks like getting links from high authority websites that will not only give high ranking but will also bring traffic.
Along with above tasks we also have to ensure social media part as it comes under offpage SEO, this will enhance our brand image and build the trust factor which will be converted into qualified leads.
Above is just a basic idea of my strategy, you can message me for any further clarifications.
Thanks
Pomisha