would you like it better with just wallboard? it will still be asymmetric but if you can find a mantel that goes with the stone you might like it more.

there will come a day when houzzers will shriek you must not under any circumstances remove this genuine bit of decorating from the past. we're not there yet.

Maybe re-stain the wood to match the cool beams. Then put in a similar style wood mantel that started where the fireplace begins and ran over the stone on the right, it could make the asymmetry look more intentional.

This is not 80s! probably more like 70s. Anyway, do you have a sense of what's behind the wood strips? Because I think just getting back to a stone expanse would be great, and then, sure, a mantel. But I feel like there might be some problem back there -- broken stone? some functional soffit? it was built crazy? If it's one of those, you might have to reface in some way...