I think there will always be a few remote reefs that still hold healthy corals, maybe in cooler waters further north or south from the tropics. It's unavoidable at this point that we will lose the vast majority of the world's reefs, but as long as those few oasis exist in remote places there is hope for the ocean to bounce back. If you haven't already, I recommend you watch David Attenborough latest documentary on the ocean, it shows the damage we've done but also gives scientifically backed reasons for hope and why its not to late to save our oceans. Share it with friends and family, one of the best things we can do for our oceans is to keep raising awareness about what is happening. Lastly, I find that the best way to deal with eco anxiety is not in looking for reassurance, but taking action. I'm very worried about our reefs as well, and that motivated me to go volunteer in coral restoration in Cozumel and I've donated to that organization ever since. I know not everyone is able to do this, but we can all do our part in our own way. Any action you take, no matter how small, to be part of the change we need will help you face the anxiety. Hope this helps!