I can help. I am an expert in this specific field of speed optimization and own a company from Romania doing exclusively ADVANCED speed optimization. ([login to view URL])
I only deliver ADVANCED optimizations, not medium ones. The market price for ADVANCED optimization is 500-1000$. I can do it for 250$. I guarantee that this will be an ADVANCED optimization (render blocking removed, plug-in prioritization, pjax, etc.), not a medium one. Unlike a medium optimization that can be done in a couple of hours, an ADVANCED one will take at least 2 - 3 days of non-stop hard work.