I did sub4sub in the beginning when my channel looked "naked", it is pretty much wothless. Go for loyal subs instead who are actually interested in your content.
You are lucky my friend. Which subreddit are you in? I am at the smallyt and youtube startups and found no luckYou've to be careful with every subreddit's rules. No doubt they would hate hit-and-runners (I got that during my first visit because Reddit's a special creature) but be nice, helpful and only link your content when requested. Once you've established yourself even more, post your own content once in a while.
Recently I tried to enter a fairly inactive and small subreddit just to test the water, had my content downvoted. But on another subreddit I frequented more regularly, it was the totally opposite. Here's the image as a proof.
To embrace Reddit, you must love it as a community. Be more active, and you'd eventually see success with it. True story.