For a richer flavor, try using a combination of bread flour and a high-quality Italian '00' flour. Ensure your yeast is fresh for the best rise. If it doesn't foam when mixed with warm water, it may be expired. The natural pressure release in the Instant Pot is crucial for preventing the bread from collapsing. If the top of the bread is not browning sufficiently in the oven, you can broil it for the last few minutes, but watch it carefully to prevent burning.