I have an eshop in non-english language in super uncompetitive niche. I need to get to top3 or higher in google. As I said it's super uncompetitive niche, so I did site seo optimization and registered my site in several catalogs and bought 3 PR4-5 links. Now the site is in top8-top5 in google. So I think to try writing comments in blogs, but would it be a white seo? I am talking about manually writing to blogs about 10-30 posts a week, what would be if I archieve my goals and stop writing to blogs? Write to nofollow or ******** blogs? Somewhere on the net, I read that writing to nofollow blogs is also effective but if you stop google will quickly penalize you, is it true? So maybe you could suggest better ways to improve positions with whitehat (or almost) and without investing money.