There are so many spells I would love to use in real life if I was a real-life wizard. One of the biggest things would be the ability to summon an iced coffee at any moment. Or the ability to take all my groceries and heavy packages up the stairs for me. Or the ability to pet my cat no matter where I am in the world. Or the ability to fast forward time to when I'm at the dentist's.
But above all, I would cast a spell so all my friends are free at the same time so we can play Dungeons and Dragons together, whenever I choose. It's so hard to work around everyone's schedules, with jobs and lives and such, but if I could just suspend reality for as many hours as we needed to get a good session in, that would be enough reason to become a wizard. But alas I'll have to settle for memes in the meantime.