What needs to be done for the setTimeout function to execute later?

To have the function passed to setTimeout execute later, you need to increase the delay value (in milliseconds) passed as the second argument. For example, if it is currently setTimeout(fn, 1000), to execute later, you can specify a larger number, such as setTimeout(fn, 5000) — then the function will execute after 5 seconds.

setTimeout(() => {
  console.log('Will execute after 5 seconds');
}, 5000);

It is also important to understand that the minimum delay in browsers is usually not less than 4 ms, and that setTimeout does not guarantee exact execution time, only the minimum delay. If you need to delay execution even further, simply increase the delay time.