Jam helped me to explore the plot from a different character’s POV & see how it can be used as a game plot. It has been just a plot in my head with no concrete medium based on a dream I had. Working on the jam helped me to develop the plot further and see how it may progress beyond what I already had in mind.
I prefer to utilise my older original ideas for jams because I have a huge pile of stuff & if I start something new it will STILL turn into a more complex idea naturally without me actively working on it.
For example Carry On was also some random dream with an interesting idea to turn into a game wth a twist ending. After using it in a jam, now it is a whole serious project with even twistier ending..