Variance

[HonestIago15]

First post, been reading for a while.
I started the STT with $150 bankroll playing the 10+1's. A bit small, but I was nervous. Over the course of about a month early this year, following standard procedure that I've picked up from forums and other reading on how to correctly play these tournaments, I turned it into $1300 dollars. Obviously, I had a run of good cards as my ROI was somewhere around 70 percent for the last two weeks, during which time I had started keeping track. Now, however, I can't seem to win any money whatsoever. For about the last 50-70 tournaments I've just been hovering around the same dollar amount, and am presently actually down approximately 200 dollars from my high. Is this normal for variance, or do I probably just have some significant leaks that didn't show up when I was getting good cards? I've compared my playing style to that of players such as Daliman on the teamfu hand histories website, and though he is obviously much better, I don't notice any major differences in general playing style. Is this typical for people starting out to win a lot of money and then just go stagnant, and even start to slowly lose money? Any tips as to how to counter this? Thanks everybody