The more I read, the more I appreciate that ancient technologies may lead the way to recovery PSHTF. Little or no international trade, even only limited trade longer than local, means that you have to make do with what little you have. For example, Japan showed major innovations, both technological and social, throughout its history, out of necessity, due to its insular culture.
PSHTF, you aren't going to have all the materials you would want - you will have to make do with what you have. And, yes, socially... It might take centuries for society to recover, if at all... Revisiting how ancient societies organised themselves may help smooth the way.
All this means that much work to not only find potential technologies, but refine them as much as possible, preserve, and spread them.
I have found out some interesting things about how some villages manage their water, and how they de-seeded cotton traditionally... it's... There's so much that could be adapted, and allow a PSHTF-society to survive and thrive...
This would be so much easier if I had some help.... I suppose I can hardly ask for a Great Architect to come down and oversee all these ideas... Truth be known, however, I would prefer a Great Engineer. After all, architects design things, but it's the engineers who take the plans and make them work.