If you can’t stop the (possible) coming disasters, what’s the point in paralyzing yourself with fear? Do what you reasonably can to prepare, and enjoy the life that you have now while it’s here.
Things will certainly get worse, and disasters will happen in the coming decades, but the end is not right around the corner. The decline will be slow, and it’s still possible that solutions, or at least mitigations, will be found. Look for little ways to contribute something positive, and try to appreciate the moment.
They aren’t going to change you view on life, but most are pretty solid. I highly recommend pretty much any books in the High Republic era, particularly “Light of the Jedi”. It’s the first of the new era and it’s a great introduction to the setting. It’s all set a few hundred years before the movies, so the Authors were able to pretty much do whatever they wanted within the basic Star Wars universe.