Get more fluent in Spanish, jazz piano, Go, Docker. Bee keeping, gourmet mushroom cultivation. Make short animation films with CSS, SVG, Web Audio, MIDI. Build "smart" systems with ESP32, sensors, actuators, interconnected and remote-controlled devices. Keep brain and body happy and productive with a jungle of wide-ranging and diverse interests. Breathe in: many books for inspiration, information and theory, thoughts…
Maintaining / improving Spanish also on my list. You might check out the Spanish Obsessed podcast (free), which I've enjoyed as a low effort way to increase exposure on drives.