Should I change to alto?

For my fellow singers…

I was asked to sing with a choir and I haven’t sung in probably 2 years. I’ve had illnesses and medication changes that have surprisingly changed my voice. I was/am a soprano that could hit a high A. Now I’m lucky if I can reach a D an octave above middle C.

Should I continue to be soprano and hope through lots of practice that I can get back into my higher range, or should I bite the bullet and tell the director that I now sing alto? I would hate to think that my voice is permanently altered.

Thanks!