The higher your winrate is, less losing days you will have. There is somewhere mtt variance calc, that shows basically even if you are top reg averaging 40% ROI/game you can still end up break even over 500/1k games etc. (you can play with it if you google "poker variance calculator'"). Secondly you have to have a good
bankroll management, in case you go for prolonged downswing, which is unavoidable even for best regs. Lastly and perhaps most importantly, as Alex said, focus on your game rather than on external factors, which cannot be changed. Playing your game every time, will bring by far the most money into your pocket. GL