Comment of other people's blogs and also people's stories..!!
Of course, do give go and progressive comments so that the author is able to improve themselves.

As for getting new subscribers or upvotes on our stories as stated by hopelesswriter, that part I am not too sure! Hehe! I hope it helps! :)

-comment on fanfics and other people's blogs.
-get new subscriber for your fics
-get upvotes for your fics