WordPress website speed optimization

I am looking for a WordPress expert who can help me optimize my website's speed. Although I have tried to optimize it before, I still need improvement in this area. My website's current load time is more than 5 seconds, which is quite slow. Therefore, I need someone who has experience in optimizing WordPress website speed. Additionally, the ideal candidate should have experience in optimizing website speed using caching and server optimization techniques. Overall, I am looking for someone who can significantly improve my website's speed and performance.