I sympathize.

I’ve had the third book in the first series I wrote damn near twenty years ago, sitting unfinished for damn near that long. The first two flopped, and it took the wind out of my sails, which led me to re-editing the first two, and intending to rejigger the third and finish it.

But the original inspiration was gone. I still have the overall plot in my head, still have some of the scenes there, but getting that to come out in words just never happens.

If it isn’t there, it isn’t there, and trying to force it ends up making crappy writing.