In 3 Gods Fishing, the cannon level directly sets the cost per shot. At the lowest level each shot wagers a very small amount, while at the highest level that cost multiplies many times over. Before choosing a cannon, match the cost per shot against your current balance.
A good rule is: divide your total session budget by at least 100 — use a cannon level close to that figure. This reduces the risk of draining your balance quickly and keeps enough shots in reserve for boss targets. Playing longer at a lower level means more attempts and a better chance of triggering a god bonus.
At higher cannon levels, focus only on large targets — chasing small fish is not worthwhile. Experienced players often start at a mid-range level and raise it only as their balance grows.