Not OP, but much writing advice with which I'm familiar, and my own experience, both suggest these are symptoms of an error made earlier and not yet recognized.

Not OP, but much writing advice with which I'm familiar, and my own experience, both suggest these are symptoms of an error made earlier and not yet recognized. If I can't figure out where the plot could possibly go from here, go back and look for where I sent it off the rails earlier such that there's nowhere to take it now; if I can't find dialogue or action that fits, go back and find where I put the character in a situation they'd never get themselves in, or miswrote them to respond to it in a way they never would. Stuff like that, especially once it's had you stuck too long for inspiration latency still to be tenable as the cause.