I am diagnosed with severe treatment-resistant double depression: Persistent Depressive Disorder with current chronic Major Depressive Episode.
Despite this being my life story, I do actually believe recovery is possible in even the most extreme depression.
If you look at the physical effects of depression on the brain, it does cause brain damage, but this brain damage is reversible. No matter how far down the hole of depression you go, recovery is possible.
If you're looking for specific personal stories of recovery, I doubt you'll find anyone like that here. Maybe look around Reddit or something. But don't be surprised if you don't see many stories. The people who recover from depression are out there living their lives rather than staying around on a forum like this or in mental health subreddits. For people in recovery (remission), they're better to stay off those sites for risking a relapse.