I think that there is scientific, religious and psychological reasons for being optimistic.
The universe is not only expanding but picking up speed (so sayeth certain scientists). As a whole, all religions are optimistic in their eschatological outlook. So much so that pessimistic sects are often referred to as "doomsday cults".
Psychologically, the quality of life for an optimist is significantly better than that of the pessimist.
At the time of this writing, much of the world has spiraled into the mass hysteria of the #chinavirus known as #covid19. I suggest that you be optimistic. After all, the universe is only going to get bigger and better!