Playing conservatively and building up your bank gradually sounds like a smart approach.
Doesn't work in no limit hold'em especially tournaments. You succeed or fail based on your best results which requires taking educated risks at the right time. If you often limp into the money ( or just miss ) it's -EV long term. In addition, overly conservative play is time consuming and can lead to impatience. The best players are mostly smart aggressive. Some of the best opportunities are when most of the field are playing conservatively.