With that kind of money you can buy a business that’s already established, thus helps you get off the ground much quicker, if you put down 500k and do some seller financing you might be able to buy something worth about 1m. If your struggling to choose an industry, maybe just look for a business you think you can turn around. Sell once you’ve increased the value, repeat.
This won’t be easy. Generally, wealthy people want one of a kind art from known artists, not digital prints. Some options:
Remember with art, the artist is also part of the product, you need to create a compelling narrative about yourself and your art, the kind of story someone would love to tell their friends because it makes them seem interesting.
If these are minimalist designs is it possible to have them pressed onto fabric somehow? I feel you need to go beyond prints for this sort of thing.