I never knew of the great art of reheating pizza to perfection until the other day. We first used the Food52 method of crisping up the crust in a hot cast iron pan, then adding a bit of water and covering to steam for a minute or two. Then, we took it a step further and finished it off under the broiler. For the love.
Is the interior of your Dutch Oven stained brown? Do you have burn spots on your stainless steel pots? Use Bar Keepers Friend, water, and elbow grease to remove. In general, try cooking with fats (oil and butter) at lower heats. If you're needing to char something, opt for a cast iron.