Depends on what amount is a big win...what do u mean...100k or what...to gain a big win needed to act like a pro.for me 400$ is a good prise and 1k is big en9ugh to earn from poker.but i play low buyins and to win such sum i have to win 2500+field.
After a big win in poker I like to take a break, because normally with a long tournament of about 4 or 3 hours for me is a long time then when I win, I finish casanda, with fatigue, maybe I desconcentro a little by the emotion.
When I get some win, I usually wait a few minutes to cool my head because you just left a final table and the game is very different from a tournament start. If you play immediately, you can get confused and make strange moves at the start of other tournaments.