Suggest best dedicated server

Hello all, I am new here and I do not know is this the right place to ask this query here or not but I hope I will get a positive response, I have a WordPress blog that is hosted on the well know hosting service provider. For the last few month i am facing a slow page and 500 internal server errors, this will affect the traffic and ranking of my blog, and now i am thinking to change the hosting provider, can anyone suggest me any other best-hosting provider?

Thank you