I would like to thank bloggertowp team. I was thinking there is no way to migrate and if migrate the blog myself from blogger to wp, the traffic to my old blogspot URL will decline. But I come to know about blogger to wp. I just use their free migration offer because I have only 100 articles on my site. Being a student I don’t have much money to spend for migration, but because the migration is free of cost, I don’t have any other option but to just migrate to wordpress.