"some days you are going to have to take some losses, so winning as much as possible on the good days is absolutely key"
our judgment and decision-making is clouded by emotions. You are likely to play a looser game and more aggressively, and as a result you'll be more apt to make bad calls and other poor decisions
Know you strength and max it out...
I would suggest you make a real effort, especially if you play online, to stop checking your bankroll so often. Keep recording your results after each session, of course, but avoid the constant checking.
biggest key to your success in these games therefore is going to be getting the maximum value with your good hands