[illuminant]

Play some games that interest you and model on paper how you think it could (or should) work.

As a mature intellectual returning to games later in life, I really enjoy financial and market simulators. OpenTTC, Kenshi, most 4x strategy games have crude forms. It may sound strange to others, yet simulated versions of real life complexity makes for gratifying intellectual challenge.

Or make a tiny game exhibiting some kernel of wisdom you have learned over these years.

Build yourself up to it, starting in the back of your mind.