On downswings and cold runs of cards, it's easy to get caught up in overplaying hands when you have them. This is a double-edged sword:
1. You overbet when you hit and don't make as much as you should.
2. You focus on your hole cards and don't realize you are beat until your money is in the middle.

The past week, I have either broken even or lost a tiny amount playing 3+hours a night. So, I started going through poker tracker, thinking about hands I was in and rethinking some things. When I went back to find a leak or a problem, I realized I was playing the same way as when I was winning. I lost to quads twice, higher set, higher flush, higher boat, etc. I played most of them correctly, but the cards fell out of my favor. A couple of those go my way and I"m not looking very hard for leaks. That said, you should periodically look over hands to figure out if you are playing them efficiently.

One more thing, make sure when you are working on a bonus that you don't make a poor decision knowing that the bonus you earn will cover your loss. I did this a couple times at first.

OK, one last thought. With all the support and knowledge here, it's difficult to NOT win at poker long term. But you must apply yourself. I would read stuff here and then go and play without sticking to a plan built on the new knowledge. It took me a long time to realize knowledge is useless if not used. I forced myself to evaluate how I play vs. how I should play. Then I played how I should play. I've been winning ever since.