I answered your reply to my post, but I was assuming freddy was causing trouble during a 4/20 run. Idk if freddy can even attack you when you have power on night three, but if she can then just stall her like I mentioned in my reply to you.
I'm gonna go out on a limb here, but I'm guessing the trouble you're having is that you're running out of power and freddy gets you. Unfortunately you cannot stop freddy when the power goes out. Either 6 am will hit or you will get rawr xd'd. So really, the answer to your question is to just not lose power, which should be possible for nights 1-5 if you know how to save power.
The real question here would then be how to save power. The answer to that is to just stay idle as much as possible. Don't close doors unless you hear bonnie or chika move next to your door, or foxy has left to attack you. Don't use cams unless you're checking to see if foxy has moved, and even then check infrequently. Also, don't use lights if you don't hear footsteps. Only use lights after footsteps to see which animatronic is attacking, and then to see if the animatronic has left or not.
FNAF, and as a consequence this game, has a problem in that the early nights you rarely get attacked, meaning it's really boring when you know how to play. But, since the game doesn't tell you the rules, it's very intense when at any point you could be attacked. So, even if it feels wrong, just stay idle for as long as you can and you should beat the first five days with power to spare.