One very simple idea that will give you a good shot:
If it is an elimination style event (competing against only your table), then bet minimum for most of the round. Late in the round, hopefully you can use one big bet to pass the leaders. After that, match their bets.
If it is an accumulation style event (competing against all chip totals), bet the max from the first hand. Switch to minimum bets when you feel your total is enough to win, or you bust out trying.
As Jack Jackson says, we talk about this stuff endlessly over at
https://www.blackjacktournaments.com/
You can find plenty of threads about general advice.