Writer, Agilist, Elder Geek
I don't like the idea of plan B.
I'm the kind of person that has come to realize that it's better to take time making a good plan A, and revising it occasionally, than it is to have a bunch of plans distracting you. If you have too many plans, then you won't focus enough on them and may give up easy since you "always have a Plan B."
However, though I believe in this approach of "Plan A first", I do think that there's one thing your career does need: a Career Emergency plan.
You're considering relocation like so many people do. You've got a lot of research to do on ideal cities, states, provinces, countries, and what have you. You're busy understanding the economics of areas, job opportunities, cultural benefits . . . and then as you do your research you find a very hard truth about your plans to move elsewhere.
Relocation may well take you to a place in the world that will outright kill you.
Let me introduce you to my favorite fictional career role model, Harry King.
Harry King is a character in Terry Pratchett's Discworld series, fantasy fiction series that could probably be called parody, but it really doesn't quite do it justice. Harry King, introduced in the book "The Truth" is one of the best role models you can have.