Hmmm is this a dumping ground for ideas about sci-fi, economy, speculative science, alt-history, and progress stuff? Cause I'm so into those! (Not that I'm actually good at economy though).
Regarding your story, there's a good resource, ever heard of the text-based MMO game
https://taustation.space/ ? It's pretty much like an interactive novel, set in post-apocalyptic future (in space). I've played it for a while and although the story line is heavily cliched, the premise and world building is very interesting, and best of all you don't even need to actually "play" the game to read the world building, just check the archive here
https://alpha.taustation.space/coretechs/archive, and as bonus there's personal "player made blogs" where players chronicles their adventures there for the public to see
https://alpha.taustation.space/coretechs/blogs. They're a good resource for your 2nd story, that share many similar traits.
Anyway as for my own prompts, I'm no writer, but It'll be interesting for my ideas just buried in my brain to get out to the world:
I shared the title in this post before
https://mangadex.org/thread/179528/5 but, from my little knowledge of Isekai genre, there appears to be no such isekai yet, it's my current favorite idea.
Title: My garage is a portal to an Isekai without any sentient inhabitants, It's a free real estate! Did I mention I also found oil and other natural resources? [1]
Demographic: Mostly Shounen, maybe a little bit of Seinen
Genre: Action [2], Comedy, Drama, Isekai, Philosophical, Psychological, Sci-Fi [2]
Theme: Military [2], Office Workers [2], School Life [2], Survival [2]
Story idea:
Setting: Takes place in modern time, year doesn't matter as long as the technology is at our level(e.g. Nukes, Internet, the ISS, iPhone) AND the current worsening of climate change, I haven't decided which country this takes place with, my country of preferences be either: Japan, USA, or Indonesia [3]. Not sure yet if even the "real world" should be our Earth I'll leave it to the discretion of those that want to adapt this. Hence you may create fictional countries or entirely fictional world, as long as some traits of the 3 countries are there, or mixed. The "empty Isekai" (which is the temp name for now), should truly be uninhibited by sentient species, there may be native animals and plants, though try to skip the troublesome part like diseases or other ecological disasters [4] by handwaving or something.
Main Character: So the MC will be male and shounen-like, I don't have an age yet but preferred to keep him in range of 14-28, Can't begin naming before figuring out where this take places, but I'll help if pick a symbolic name once you decide the culture. Family? Haven't decide yet, but he'll be single virgin at the start. Since his age is still tentative, incomes at the start are unknown for now, but he would have ample enough resource to kick start the business of exploiting the empty Isekai.
Some of his characteristics: I think it's normal to explain his flaws first just like most manga, he dislike money, dislike hard labor, is selfish (on short term), bad at communicating, impatient, and indecisive (on short term). He likes Science, Philosophy, Psychology, and 2D stuff like Cartoons, Comics, Anime, Manga, Games, etc. But he don't live in 2D since he actually longs at the vast universe of the 3D world. He recognizes the threat of climate change that will ruin his dream of exploring the vast universe, he also dislike paying for 2D stuffs and basically pirated them, but at the same time is also sympathetic to the creators of 2D who also require earnings to make a living. He longed at creating a utopia where everyone including creators and consumers to be fully provided with needs so they may enjoy do what they do, as a secondary dream. In contrast with his bad communication skills, he is good at listening, deep thinking, not being dense, great memory and understanding the nature of problems and how it came to be. This story may have a Grey on Gray morality though, so MC may do questionable deeds, that's for the "greater good" of his vision, but considering Death Note is considered Shounen, I think that's fine.
Plot: I think I overwrote the other sections leaving this one quite predictable eh? So MC finds portal to empty Isekai in his property, the portal doesn't have to be garage, but something large enough for a car to get in and out [5] and then he decides to exploit this empty Isekai that's rich with natural resources. Keep it a secret from several evil organizations and stuff, starting a business to dominate the market with exploits from the empty Isekai, use money so he can exploit the empty Isekai better, have a goal to create a utopia, save the Earth from climate change, and start extensive space exploration. You know that kind of stuff, you could almost tell that I got many of the ideas from Dr. Stone.
[1] The title is subject to change, but you can get the general idea from this one.
[2] Not sure if they're even needed to be tagged here, but at least some elements of them will appear here and there.
[3] Japan, because his character, how he came to be, some of his lighter goals makes more sense to be there, and maybe a bit more economic advantage for his rapid developments in the exploiting of empty Isekai to make sense. The USA because good geography and greater market competition leaves open to more story about the market, also more potential actions and stuff. Indonesia because it's where I live, and I have greater knowledge and could give more flexible ideas.
[4] This may be expanded in the later story where either or both worlds are impacted with such disasters due to the other.
[5] There may be a possibility where we can upgrade the portal, like allowing larger size or more portal points as the story progress.
Of course I also have more ideas, such as someone reincarnating into the Classical Age Mediterranean (like shortly before Punic Wars), and their attempts at modernizing the societies, and yet more alternate WW2 history stuff, though those are in the vault for now.
So what do you think?
Sorry for the disorganized writing, I wrote it in unorganized order and take several breaks.