May be your site may get penalised by over optimization or anything else. Will you see any kind of message in webmaster tool?
Check your all back links manually and check their relevancy. If you feel that it is looks like spammy, remove those links by webmaster tool.
As you say that you are beginner in seo started work last 3 months for promoting your site. It indicate that you want get fast result without understand of proper flow chart of SEO.
I advise you that many article and blogs are available for SEO study. Why you not try them and understand whole...
You all ready say that your expired domain have not relative back link. Always remember that relevancy is more important to PR. 301 redirect passes link juice to your money site but back links are not relevant, that's why your site may penalised by penguin update.
It is not important that get more back links in single day. Quantity is not important, quality is important. If your those back links are not relevant to targeted site, no meaning for it and you will be punished by penguin update.
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