That's different niche blog..if all topic mix in 1 blog..becomes "chap pa lang" blog or so called "rojak" blog..let say someone looking for food and get into your blog through search engine..if he found your blog only have 2 or 3 posts about food..and other posts are talk about personal rant..do you think people will stay ?
Specific topic is always better than rojak niche...(Unless you're going for personal blog..that's different case)

Correct me if im wrong..=)

can actually stumble upon brings traffics? I'd tried it b4 but im not sure how it works..because when you submit the article..they never require you to put your blog post URL..but i did inserted the blog post URL into the post...

Or i did the wrong steps?

depend what keyword that you're targeting..you have to check the search volume of the keyword b4 you optimize it..if no one search for the keyword..then you got no traffics at all..

I'm using Google Adword keyword tools to do this research..
> https://adwords.google.com/select/KeywordToolExternal <

Goldfries..I know you're very good in designing a banner..do you mind to design 1 for my feedburner for free? hehe..
I just need a simple but looks nice for my feedburner instead of using the white 1..=)

You can learn a lot with all the Pin Thread here..=)