In middle age, having achieved nothing and possessing nothing, how can one overcome the lows of life?

There's no way out, so I advise you to be more realistic,
Accept the arrangements of fate.
You're already middle-aged, your habits, perceptions, and knowledge have long been fixed,
If you could have succeeded, you would have done so already, and wouldn't be empty-handed and unaccomplished at this age.
Most of us are ordinary people; accept your mediocrity,
Cherish the family, children, and loved ones you have now, and don't dwell on unrealistic things, wasting your energy.