Plan 1: Raulothim's Psychic Lance. By the time I get to take that spell, I must have had at least one ASI so I'll just take metamagic adept for subtle spell. I just have to know the name of the target and be within 120 feet of them (240 if the second metamagic option I take is distant spell), and it's pretty close to a guaranteed kill vs. a commoner, no murder weapon, and nothing showing that I was there.

Plan 2: Clone. Claim that it's some revolutionary stem cell rejuvenation therapy and sell it to the super-rich. (Though I might make it fail accidentally if it's someone like Murdoch or Kissinger. Payment in advance, no guarantees, and I'll do it on international waters.)

At a high enough level, I’d use creation on either gold or diamond. Might be hard to sell a 5x5 block if either but you’d make good money if you could. Or just become a human 3D printer and sell off the things you make.

If there is a spell capable of breaking down things into its basic raw elements, that would be it.

Garbage is abundant, as well as junk.

Imagine deconstructing anything back to its basic elements and then sell it. A gigantic pile of mixed junk instantly deconstructed and turned into ingots of pure metals, carbon, and other elements.

Not very experienced, but I'd probably True Polymorph dirt/Steve Huffman into some gold and sell it.

Charm, Modify Memory, Illusions, Disguise Self, ...

Always make yourself look way richer and important than you are, smaller millionaires and celebs will flock to you and the bigger fishes will try to use you but they can't because... repeat from the start.

Suggestion. I could really use a better job with better pay.