Traffic gradually decreasing

Hi,
I recently moved from blogspot to custom domain. After that traffic started to decrease day by day.Peoples ae comming by search engines only bit it is decreasing continously.Any reasons??
And i also wnated to know about sitemaps.I deleted my old sitemap of my blogspot and added a new website in the webmaster tools and submited new sitemap..This Process is a correct one or wrong

See original post by dhamu