Ideas do not just appear. Despite their unforeseeable and chaotic nature, you do have influence on the development of many (good) idea
The Double Diamond Design Process illustrates how ideas can be the result of a calculated and planned process.
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Research and insights are the key. Good ideas grow from a solid understanding of the needs and desires of your target group. You gain insights by exchanging ideas with your potential target group. In this way you correct possible misinformation you have researched about your target group.
After creating a user persona, you can state the nature of the problem you are trying to solve. By defining the problem you have a starting point for how to solve it. For more information, look up Customer Discovery.
The phases ideation and prototyping mirror the previous two phases.
Ideation is the process of trying to generate as many ideas as possible to solve the stated problem. It is not important how silly or seemingly impossible the idea is. The more ideas you have, the more good solutions can exist.
Similar to "Research & Insights" "Prototypes" thins the number of ideas from ideation by separating those ideas too unrealistic to be ever put into practice from those that have a chance to become a Minimal Viable Product (MVP).
First: Create up to 89+ ideas for how to solve your problem from the previous phase.