What Isekai anime would you make.

At this point there’s so many isekai anime’s out there and just a few that’s a cut above the average rest.
What isekai would you make if you had a chance?

title: Isekai stoneage

For me I imagine a guy who got isekaied to the stone age period (lol) and he would have to go through having to survive in the harsh environments. Ofc maybe a love interest popping up halfway but No “harem” yeet we’ve had enough.
And also with good world building where they go through the seasons.. and YESS a plot twist.

Aliens appear where he obtains maybe a weapon of some sort but the aliens disappear. But thats it!! Cause it can’t sci-fi up more than that. Then continue to maybe taking over his tribe/settlement and turf war between other tribes and races and fighting dinosaurs lmao.. and maybe tame a sabertooh (with the weapon/tool he stole from the aliens) ****.. well so and so

Would love to read and imagine ideas of other people too…