Alright then I take back the statement of "inbetween Ramayana and Mahabharata"
1)You can make a story in which Mahabharata has ended completely. All the heroes and enemies are dead. All places of wonder in ruins. Make something like the dark ages after Mahabharata.
2)an isekai where a bunch of kids are thrown into a world where Indian look alike people exist but they don't practice any religion and are tribals. The major power in that would practices any one of our religion. Since you can choose a non-abrahamic religion here then it can bee shown how our band of teenagers interact with this world.
These are ideas I could think of at the top of my head