Bookworm Author it is then, now how should the setting be? So the options I give will be isekai related and three non-related. 

Isekai Summoning/Truck-kun; Transmigration into Parallel Dimensions/Another World; Reincarnation into Past/Future

N/I (Not Isekai): Sci-fi (Future), Fantasy (Middle Age to Ancient Times), Modern Fantasy (Now with fantasy elements)

Personally I'd like a mix of these, like some weird, summoning into the future to fend off an alien invasion or something. You can combine these options to come up with an interesting little setting. 

You can choose two of these options to make a mix, So you can do anything together.