I want to read more stories where the protagonist never gives up trying to return to their original world, and they are tenacious to the very end with trying to achieve it.

I'm especially looking for stories where the MC is really distraught over their forced reincarnation and the loss of their original family / lifestyle. It can be any genre, any age rating, from any country

These are two polar-opposite stories that I liked reading for this concept:
Kill the Villainess (especially)
FFF-class Trashero

I Get Stronger the More I Eat ending was rushed/axed though.

I Hold the Tyrant's Heart

S-Class Hunter Doesn't Want to Be a Villainous Princess kinda

Dungeon Dive: Aim for the Deepest Level