In 2023, there are several viable online business opportunities in Nigeria that you can consider:

1. E-commerce: Start an online store to sell products or services. Focus on local products and leverage platforms like Jumia, Konga, or create your own website.

2. Digital Marketing Agency: With businesses looking to establish a strong online presence, offering digital marketing services can be profitable.

3. Freelancing: Tap into your skills, such as writing, graphic design, web development, or digital marketing, to offer freelance services on platforms like Upwork or Fiverr.

4. Online Coaching and Consulting: Share your expertise in areas like health, finance, or business through online coaching or consulting services.

5. E-Learning: Create and sell online courses or tutoring services. Education-related businesses are in high demand.

6. Agritech: Invest in agribusiness technology solutions, such as online agricultural marketplaces or farm management software.

7. Dropshipping: Start an e-commerce business without holding inventory. Source products from suppliers and sell them online.

8. Affiliate Marketing: Promote products or services from other companies and earn commissions for each sale or lead generated.

9. Content Creation: If you're passionate about a niche (e.g., fashion, travel, or food), create a blog, YouTube channel, or social media presence and monetize it through ads, sponsorships, or affiliate marketing.

10. Mobile App Development: Develop mobile apps catering to local needs or specific industries.