you might want to consider Tajikistan, I'm not a cyclist but a motorcyclist and I met a crazy numberof cyclists there riding the Pamirs. Amazing scenery, friendly people, cheap.
Funny thing is I have been riding with an Indian rider in peru and Ecuador over the last few weeks and he is dreading gogin home. he put it in perspective from his point of view,he said "Peru is so empty, India a little over double the size and has a population or 1.3 billion...Peru has 33 million."
If Tajikistan is a little too far afield have you see the TEMBR Trans Ecuador Mountain Bike Route, there are actually two of them, a single track and a double track versions. I have ridden quite a few section over the last few months and it is very we planned.
There are los of options for routes on this site too...http://www.bikepacking.com/bikepacking-routes/