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I need to know how can I personalize the title tag individually in my categories?

I have a website about "Download of games" and im planning open one about "games online" i know that "games online" its super hard to get good ranks, soo im thinking and do a 301 from my website of "download games" to my new website, do you think that is a good strategy ?

What I can do to avoid the duplicate content on the index and in the categorys, I cant block my categorys, cause are pages with big autorithy, so what i can do ?

Where i can get strong links, to my website easily, and with quality ? blogs with dofollow it helpfull ? and how i can find this blogs ?

As the rejection rate may influence the SERPS?