I quickly crossed off "teaching" from my career possibilities, post-seminary.
I had heard from other ex-seminarians (let's face it, many are "teacher material") that you simply couldn't earn a living wage as a teacher, especially in an SSPX school.
I took his word for it, and never looked into it for myself.
It's a great topic for another thread: how an increasing number of objectively important, useful, great skills are USELESS for career purposes. No one reads anymore, so writing a book, even a good one, wouldn't support you. And so on. History, music, poetry, singing, pretty much anything Liberal Arts UNLESS you want to go into teaching/academia.