Yes I have achieved amazing results !!
With my own sites as well as for others.
Improve your Wordpress site speed. Google rewards faster loading sites with higher rankings (FACT) than slower ones.
(Fact) If your site takes more than 4 seconds to load, people click away from it. loosing you sales.
What you get my 19 years SEO experience plus:
Google Pagespeed Insights optimization will be done on your WordPress website/ Blogs to increase the Page Speed for both mobile and desktop which helps in better ★ site performance, ★ quick load time and ★ improved organic performance in Google search results.
(This gig will also boost indirectly your gtmetrix and yslow result as the performance measure taken here have positive impact on it as well.)
Your site will look the same but be optimized to the max.
So what I will do?