Making memes and comments. I had a LOT of free time though the be engaged and involved on the site. I don't want to say it was a lot of work because it was a blast! It just comes down to activity.
That's exactly what I did when I first started...not so much anymore...it's too nice outside this time of year to always be inside...but winter is coming....
People who up vote all the comments on their memes usually get there faster. Of course, it's not compulsory to do so but many here consider not doing so discourteous.
It also helps if lots of people like your overall participation. I always upvote but lots of meme commenters don't upvote my stuff; I assume some have been offended earlier. That's life & I'm not going to go wish you washy for points.