Novel and ff ideas for authors

What would happen when a useless human gained the power to be immune and resistance to higher dimensional entities and attacks has many other immunity and resistance and is immortal that can heal from anything and everytype of concept, even existence and conceptual erasure cannot affect him/her well you can say he/she is too broken but how can it be broken if he/she doesn't have a power besides that with no plot armor and only have a normal body as strong as an average human and worst of all he/she is an otaku and also a shut-in and one they he/she found out that he/she suddenly got transported to another world of a normal fanstasy world where a group of classmates summoned as heroes from one kingdom and other kingdom who can summon beings from another worlds hailed as heroes too. And in one country a villainese was born because of that girl who got reincarnated and was called a saint tooked the duke's daughters fiance the prince, and high up in the sky are a huge and massive angel guarding a gate connected to another world probably the garden of eden.

And in another continent is a place where magic is weak and also martial arts but in that continent it was ahead from the other continents as it has some modern technologies because in the past a group of four the hero, the sage, the priestest, and the holy knight defeated the demonlord and was hailed as the 4 great heroes who defeated the demonlord but that was the past and as suddenly the demonlord was ressurected but something is different is that the demonlord doesn't have the will to kill all humans in the continent instead the demonlord wanted to rule it with strange weapons and dragons made of metal or modern weapons used in war they tried to stop the demonlord but instead of defeating them by killing some nobles the demonlord instead helped a kingdom that was about to fall because of a war between two kingdoms of different countries and the demonlord succesfully repelled the other and when the demonlord did that the demonlord made a promise that he/she will not let the people who suffer be what they are today and made rules similar to modern earth like equality and slaves are no longer allowed and so the demonlord did that ti'll he/she reached the highest of power in the continent and become its ruler then gave them knowledge and technology centuries ahead.

And in another continent surrounded by smaller continents are the place where arrogant immortals was hailed as the strongest as they are stronger and above the mortals and simply don't care of them but they still follow the rules of not hurting mortals but demonic cultivators do not as they use the blood and souls of any being they encountered to nourish them or create weapons out of it and many other species besides humans since when a being becomes an immortal their race also change into one, and above these are the upper realms where true immortals live however since the world is too big they still cannot see other continents besides the one below the upper realm and the highest immortal and dao realm probably because of something blocking them from spying beyond.

And in another place is a sea a vast sea where many terrifying species lived and suddenly a continent appeared out of knowhere but can it possibly be called a continent? Since the sea is so massive that is several times bigger than many solar systems combined so can it still be called a continent? this was a world before a normal world where suddenly people suddenly obtained the power to travel other worlds out of knowhere and that started an era called ??? and the people who travels to other worlds to help the humans become become gods themselves and suddenly one day the world began to darken unknown to them a truck-kun was already eyeing them from the outside of the planet ready to finish its job before they realize the whole world suddenly got integrated to another world and that is this sea.

What would the boy/girl do if he/she suddenly got transported to that world? would he/she have a good life or a life full of suffering but can he/she feel that? since he/she doesn't care about anything besides playing games and watching anime and reading a novel would this journey really be called a journey if he/she a useless person do nothing besides that or will he/she encounter someone to adventure with? but can that person do that?.

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What do you think of my idea is it good or bad? Btw is my grammar good? Or nah