Selling minimalistic digital art offers several avenues:

Prints and Frames: Creating high-quality prints and framing them can cater to those who prefer physical art. You can sell these through your website, online platforms, or local art fairs.

Online Platforms: Utilize online art marketplaces like Etsy, Saatchi Art, or even your website to sell digital art prints. Focus on quality presentation and marketing.

Collaborations: Partner with interior designers, decorators, or furniture stores. Your minimalist art might complement their aesthetics and could lead to collaborations or sales.

NFTs (Non-Fungible Tokens): While you mentioned they’re “a thing of the past,” NFTs are still a viable option. They offer digital ownership and provenance, which can attract collectors in the digital art space.

Co-founder or Partnerships: Bringing in a co-founder could help with business aspects like marketing, sales, or scaling the business. However, it’s not mandatory; you can also seek partnerships or hire freelancers for specific needs.

Market Research: Understand your audience and where they’re most likely to purchase your art. Focus your efforts on those channels to maximize sales potential.

Ultimately, explore various avenues simultaneously and assess which aligns best with your goals and reaches your target audience effectively. You might not need a co-founder immediately; partnerships or hiring expertise for specific needs could be equally beneficial. Stay open to evolving strategies as the market changes.