Oftentimes they are not marked by material goods.
They are often marked by accomplishment of work over a period of time for a good outcome...but mainly because...well because of celebration with friends and family and colleagues.
There was a Holocaust survivor that said she looked at people and asked if they would hide her. If you have lots of people that you have good connections with, then you have lived a good life.
Happiest days are spent in nature. Beautiful places. Happiest days are spent in laughter, exploration, accomplishment. Happiest days are spent in relaxation.
Consider arcing towards happier days.
And how to build a life centered around happier days.
Also understand that oftentimes we do not understand what is good or bad for us.
And in some cases, well, everything that happens to us can be good.