I think you should use sunreddit that is relevant to your niche and try to comment on other popular subreddit post
or you can try traffup.net to get lead to your site. you either buy point that will enable people to click on your site link or you can engage in retweet, like page, follow others or visit their site to earn point.
Thus, I can help you on traffup.net, With this site I was able to generate 500followers a day for a client

Not trying to be rude, but I think this post shows lack of understanding on what Reddit actually is. You can't say that "niche doesn't matter" because the guys who are up/downvoting your post deeply care. They're signed up for a specific thing, and do not want just generic something in their subreddit.

Just use the search and lurk around, it's not much more complex than that.

reddit and many more social book marking site are available .