I read something about Pablo Escobar - the infamous drug cartel leader; which said at one point he fell into a deep depression.
Not because he was a violent drug cartel leader in fear of his life constantly, or the guilt around the harm he'd caused, the murders he'd caused, the deaths of coca growers, smugglers, dealers, and addicts and all the other victims.
But because the cartel was making millions of dollars per day (or week, I can't remember the specifics but it was a short period of time and in the 80s so millions then was much more than millions now) and he had literally nothing left to buy or that he wanted to achieve.
He had houses, cars, planes, boats, even helicopters and submarines, a private zoo, every material possession possible and had nothing else to want or strive for. He'd infiltrated corrupt governments and destroyed other cartels so nothing was challenging him for vast periods of times. He had children, and any number of women wanting to be with him.
There is a lot of psychological research around the adverse effects on mood and self-concept of having no sense of 'what do I achieve next?, what am I working towards now?'
I think it can be psychologically catastrophic to have nothing left you want or can achieve and at that stage, bird-song or a nice bath-bomb just doesn't give the same amount of pleasure.
I'd give it a really good try though 😆