Here is one technique that helped me to advance a Story that I was trying to write:
Try to concentrate on only two characters of your story and write an "elevator pitch". Preferably two characters that are not too similar.
What would these two talk about if they were to get stuck in an elevator together? How would they try to get out?
Imagine a 10 minutes dialogue with little to none environment.
Try other 2 characters, or extend the stay in the confined space of an elevator to a couple hours, when the boredom starts to kick in.
Your story is set in a "non-contemporary-world" without elevators? Let them fall into a hole of some sort, while walking along a path between the fields.
this does seem fun and i will attempt it!