Frameworks for developing new business ideas

I was thinking through systems to develop new business ideas. Some below:

• Market-first - Pick a market you like and build products for that market.
• Audience-first/community-first- Pick a specific audience or group of people, and build products for them.
• Problem-first - See problems around you, and build a product that solves one of those problems.
• Theme-first / Trend-first - See a trend/theme developing and build a product from that (e.g. Blockchain product, AI something).
• Platform-first - Find an existing platform that is growing quickly and build a tool on top of or around that.
• Distribution-first - Find a marketing channel that could work and then build a business around that.

What are your favourite ways to come up with new business ideas?