Is there any hope for this fern? I overwatered? No idea. I only gave it water when surface of soil in pot was dry.

If anything, you underwatered it.
I would cut back all of the dead and almost dead stuff and repot it into the same sized pot. You could add a bit more peat moss to the potting soil. These guys like dappled light and to be moist all the time, not drying out at all. But they can't be soggy wet either.

with BigBill - lots of water (but don't let it sit in water) and no sun. Bird's Nest Ferns are epiphytic - that means in habitat, they don't live in soil. If you do repot, use something organic but fast draining. My go to for Bird's Nest Ferns is voilet potting soil and orchid bark mixed about half and half.

Keep it in a small pot.

I was told when I bought mine to water it like a bromeliad...by just putting water in the center crown where the leaves emerge. This was YEARS ago. I didn't follow that advice, I planted it in the ground and let the rain water it. I would like to try and mount one and see what happens

Thank you all for this wonderful help!

Your Birdsnest fern looks like one I used to have a few years back, Bird's Nest Fern (Asplenium antiquum 'Crissie') and it appears to have been watered in the center of the rosette which (in my experience) is not a good idea because when water sits in that center, it will cause rot. As Daisy suggested, use an airy, well draining potting medium and always water beneath the leaves, atop the soil. When mine was outside, I'd spray it with the garden hose but I would always tip it afterwards to allow any water in the rosette to drain away.

Thank you, plantladylin!

Yeah I knew when they told me that it was not the right way to water it LOL. Glad others agree. I scoped out a place to mount one up in a bauhinia tree. I'm going to get a cheap small one and try it in case its a failure.

Mine is outside in a shaded area and gets a lot of rain pouring off the roof, it looks great.