In reply to Exodus:
Lots of peaks there, you might want to be a bit more specific and narrow down your areas for more precise beta.
From what I've climbed there?
Sajama and Parinacota are good for solos and they're high, easy and have no glaciers.
Illampu is a nice peak if you want something a bit steeper, but it has some glaciers. They would have been OK for a soloist when I was there but it was ages ago so could be different now.
Pequeno Alpamayo normal route has negligble crevasses from memory.
LaPaz was OK to find partners in city hostels, but not great, though it's over a decade since I was there.
Ausangate is beautiful area and a decent climb but has a few, probably solo-able, crevasses down in the icefall (June 2011). I've not been to Huaraz, but it's probably better to find partners there for the Blanca than finding partners in Cusco for Ausangate or other Vilcanota peaks.