I'm not qualified to give spiritual guidance. You may need some years to recover from the grind that got you where you are today. my personal path of self-discovery has been fulfilling but I wouldn't say it brought me joy (yet). if you miss the adrenaline perhaps you would enjoy a competitive activity like sports or chess.

> I don't even indulge in anything expensive, so I don't even feel motivated to earn more money or spend it.

Thats probably healthy.