As people have said, it's impossible to make something that appeals to everyone, but for the lols, if I was told with a gun to my head I had to make the most broadly appealing thing possible, here's what I'd make....
It's an adventure story set in a medieval sort of Fantasy world with a Lord of the Rings sort of aesthetic.
About an attractive young white man who discovers he has a great destiny and gets some kind of special magic sword or artifact.
He has a cool older mentor who is PoC because that's progressive, but not TOO progressive, wouldn't want to upset anyone, but this way nobody can say "all the important characters are white".
He's in love with a beautiful elf princess who can fight a little bit with her bow or magic, but not too well because that'd upset some people, she definitely needs to not be as strong as the hero and to need rescuing on exactly ONE occasion (because if she needs rescuing more than once, she "needs rescuing all the time" and is "annoying", but once is okay).
But while he has a clearly hetero intended main romance, he also has a male companion or frenemy who is super-hot and he has sexual tension with and it's totally shippable, but it'll never actually play out, it's just queerbaiting to keep the people who are into that reading.
He takes his shirt off at least once to show his amazing abs, so the people who are into dudes can ogle, but for people who aren't into dudes it's like... aspirational/power fantasy because this guy represents you!
There are lesbian minor characters to keep the lesbians happy and to make it lightly progressive, but they're both hot femmes and it has no story impact or social commentary so it doesn't upset anyone too much.
The bad guy is an evil lord of an evil empire that wants to take over the world and enslave everyone or something, nothing that might be politically outrageous to anyone. His army is made up of undead skeleton soldiers who are grateful to be killed because it's a release from service, so it's GOOD that the hero slaughters his way though armies, you can enjoy the spectacle of violence completely guilt-free without having to think!
There will be a SHOCKING twist where the hero discovers that he is in fact actually in some way related to the villain, let's go with... he was actually created as a magical clone replacement body for the evil lord and was spirited away by his mentor figure who was one of the evil lord's knights and has been trying to atone ever since. The mentor dies almost immediately after imparting this info.
In the end, the hero overcomes the villain partly due to the villain's own hubris and the oppressed village folk rallying behind the hero and he takes his place as rightful king and unites his kingdom and the elf kingdom and everyone lives happily ever after.