JavaScript code:

function getRandomInt(min, max) {
  min = Math.ceil(min);
  max = Math.floor(max);
  return Math.floor(Math.random() * (max - min) + min); 
}

function getBait(){
	let el = document.getElementById("baitarea");
	let baitText = el.querySelector("strong").innerText;
	return Number.parseInt(baitText);
}

function autoFish(minIntervalMs, maxIntervalMs){
	let el = document.getElementById("fishinwater");
	let btn = el.querySelector("div.fishcell img[style*='inline']")
	let delay = 100
	if (btn != null && getBait() > 0){
		btn.click();
		delay = getRandomInt(minIntervalMs, maxIntervalMs);
	}
	setTimeout(autoFish, delay, minIntervalMs, maxIntervalMs);
}

autoFish(5000, 6000);