Here are my non-professional thoughts. If it were mine I would cut below those leaves dust with cinnamon set it to the side and watch it. If it's still alive when the weather gets nice put it outside gradually in the sun and see what happens. Mine is tough as nails. I had an orange one that I wasn't crazy about, I took a cutting off of it, and threw the mother plant in the trash bin in the greenhouse where it laid for months and when I took out the trash it was still alive. So don't give up.
And if sympathy does any good, that does look like something bacteria, viral or fungal to me. This advice is worth what you paid for it.
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