Well, Hollywood crap is usually because Disney bought the rights, found a woke director who doesn't know or care about the previous movies, charcter development, or sex and decides the MC is now transgender or something. I guess MC could start wearing dresses after having so many kids? Look at Bruce Jenner! Or don't!!!
A full epic 3 book sequel would be the worst... but a short one off with the kids could be fun, but only if YOU really wanted it, since you'd be writing it. I, like many others, have our thoughts, but...
The only possible challenge to MC might be Hel, who we saw ride off into the sunset. Her story is still kind of open, and she IS powerful, although not necessarily evil. And seemed to have some transdimentional power, along with her siblings.
All that being said, you do you!