Depending on stakes but I always try to take it slow during the very early stages of tournaments, a lot of players come over very aggressive to try to build big stacks
If you're busting out early, you may be overplaying your hands. Early stage you are still very deep stack and it's easy to just want to put in lots of chips with weaker holdings. But when you are this deepstack, the only thing that calls your overplayed big bets is a very strong hand. So it's very probable you bust or spew off more chips than you should per hand.
Play deep stack tournaments, don't over valuate your hands, don't let your emotions decide your actions and drink something from an old witch to have more luck.
Poker requires patience and discipline.
If you are tired then you need to take a break for a few days.
The break will benefit you, will allow you to accumulate patience and be more disciplined.