Be a Transmutation Wizard, using a woodcarver's kit to convert metal objects into wood that you then carve into impossible shapes.
Create fantastic sculptures that'd normally take years in a fraction of the time. Get spells like Wall of Stone, Shape Stone and Fabricate to create houses in a day. The houses might not be pretty, but being able to build a fort in a week is quite the feat.
Use Illusory Script to con someone into signing over their property.
Build a Teleportation Circle in two different cities, then charge people money to use it. Make sure to put it next to a bounty hunter guild or the local jail, in case people "randomly" use your teleportation sigil from another source without paying. Make sure to Hallow it so that planar travelers don't try abusing your public information. If possible, I'd get the local government in on it, so that it's already attached to an isolated part of their jail system. Give government workers a refund, make sure to have your profits taxed, and it's a good long-term investment for a city.
Be a Wind Walking Taxi Service, to transport high-paying travelers across the country.
Arcane Trickster with Ritual Caster. Combine using Detect Magic and your familiar to scout out the wealthy or the magic users from a crowd. Use your invisible Mage Hand to pilfer their stuff. Even if they notice they're being pickpocketed, they'll never know it was you.
Make a level 3 Continuous Flame in a lamp. Now it shines through Magical Darkness. If you want it to be resistant to Dispel Magic, make it a level 4 casting (as most people wouldn't bother casting an upcasted Dispel Magic on a supposedly level 2 spell).