This sounds like ennui brought on by burnout, perhaps not necessarily arising from physically manifested work but just overthinking. Totally empathize. Perhaps

This sounds like ennui brought on by burnout, perhaps not necessarily arising from physically manifested work but just overthinking. Totally empathize. Perhaps speak with a therapist to get started. It may not be about rediscovering your love for this again, but just a passion for something new. It does sound like some degree of turmoil there.