To maximise staying under the radar, probably fabricate. You'd not be amazingly rich, but you could establish a decent living with a lot of free time. If you want to be amazingly rich and you squint hard enough at fabricate and what tool proficiency count mean in the modern world you can probably make some bank with a bit of study of chemistry or engineering. Being able to magically create complex drugs or something is going to draw attention though.

Eldritch blast + spell sniper for no particular reason

Prestidigitation, and a residency in Las Vegas. David Copperfield was able to buy a private island, imagine what I could do with real magic!

1. Learn charm

2. Use it to get hired as the pastor of a megachurch

3. Use it on the congregation

Use Augury to slightly improve my odds in online poker. My winnings are legal and legitimate, I don't have to leave the house so no one can tell I'm doing magic, and there's nothing to notice other than I'm unusually good at the game.

EDIT: On second thought, online sports betting is a thing now. I'm changing my answer to that.

You could get some great use out of fabricate and proficiency in something related to computer architecture.

Legend Lore could equally grant you valuable knowledge to sell, and similarly half the divination spells could make you a very successful gambler.

Suggestion. And then go to Wall Street :)

Wish is an easy one, since it can be used to cast most of the other spells talked about here

Clone, immortality without any of the normal downsides (I can choose to die still and don't need souls or any bs like that)

Identify and go pawn shop hunting and the like

Really most divination spells would be solid for stock market manipulation

Enchantment spells for manipulating the corporate ladder, or getting into politics or something (mass suggestion in the really any political nexus, geus for more targeted things, modify memory, etc).

Healing and revivification spells and sell my services to the elite, bring back the dead, speak to loved ones, etc. Clone works well here too, especially since it has age manipulation.

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

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.)

Mending, open a phone repair business. People would just think I’m really good at my job!

Also: Borrowed Knowledge + Fabricate

Fireball