Will it affect my SEO ?

One of my WordPress site is getting good traffic and number of visitors. Since last month or so i am not safisfied with my hosting company so plaing to shift my site to new host, I am really confused on below matter, can u guys pls guide.. 1) Will my SEO be affected ? 2) Will my Alexa Ranking be affected ? (I know it does not matter now, but still wanted to know) 3) My traffic and my eaing ? 4) Will my keywords that are indexed in google (nearly 3000+) will be affected ? Pls guide i am really worried.