If I were a wizard, I would make potions to make people’s lives easier. Like making a speed potion or a flying potion. Maybe an intelligence potion to make people smarter. Invisibility potion also makes sense but people may use it for bad causes like entering a dangerous area or a bank to steal money. I would not make that potion. If I made that I would only give it to military so they can fight with ease. I mean there is no rule such as “Do not use invisibility potion in war.” right?
Aside from potions I would use my staff and spell book . They are pretty good too. But, what am I going to use them for? Nah, I would give them to military as well. But can they use them? If not, I would give it to a museum for people to look. It would be dangerous though, it must be closured in a safe area. If not, it could cause the world’s end.
To think about it, in this time being a wizard doesn’t really do anything important. In medieval ages though, it could work good, at least in stories.
Anyway if I were I would make the good and the bad karmas appear quickly, so people would be nicer and more careful. We would all face the consequences of our choices and behaviors. That way a huge change of mindset would happen and the crime rate would decrease.