IMO a lot of the doomer garbage comes from people who are disconnected from nature completely. I think they live in bubbles of digital doomscrolling and never literally touch grass. Because if you get outside of oppressive concrete urban environments and visit the forest you will see nature persisting along just as it always has. And as we are part of nature, we can also persist along with it.
The technology of modern living is also reason for hope. With some effort individuals can live independently without the need for municipal utilities of any kind, and enjoy the freedom that only self-sufficiency can provide. But people seem to be very complacent these days and unwilling try anything that seems hard. Meanwhile we have all the information of the world at our fingertips for easy access to learn how to do anything. We can each accomplish almost anything - with the info on the Internet I have been able to learn and do anything I wanted to do.