> I'm using MVC design patterns for some codebases, I'm using DDD plus Event sourcing and Event Driven for others.

All examples of OO nonsense. There is only one pattern you need (functions) (tongue-in-cheek): https://fsharpforfunandprofit.com/fppatterns/

Edit: Also consider using the ELM architecture instead of MVC: https://guide.elm-lang.org/architecture/