If your tea is lacking flavor complexity, it may be an issue of the brewing time being too short or long, but it's more likely an issue of brew temperature or water to leaf ratio (not enough leaves for the amount of water you're using).
If you prefer your tea strong, don't brew it for extra time. This will make it bitter. Instead, add more tea leaves to your brew.
Above all, follow your taste buds! Follow the instructions for brewing on your packaging, then adjust to your liking.
Black tea is the perfect latte tea! Dress it up with your favorite milk choice and some sugar. For a cozy afternoon, drink it hot. Want something cool? Pour over ice!