Be a Mage in Another World

When a person with modern knowledge travels to the magical world, what kind of wave will it set off? Although Lin En is a magician and his family is a small noble, he spends too much money on magic. Alchemy potions, inscriptions, enchantments, magic circles, etc. Are not big money swallowers. What to do? Yazi can only rely on scams such as the Tulip Bubble and Ponzi Scheme to deceive the nobles of Loren and occasionally cut leeks to survive.