Hi ElCambio, sounds like a goal you're passionate about
But remember we're talking about not limiting yourself here, right??
So if, for any reason at all, you can't hit that specific five year mark, it can still be OK.......still plenty of opportunities. Either further towards that goal or towards new/different goals you may find on the way.
But if you maybe aren't going to be getting "there" by then......well timelines don't always work anyway.........maybe you could be helping others with some private tuition while brushing up on your skills at the same time, maybe spend a little time in Spain to help you absorb the language a bit better, maybe see if there are any Spanish exchange students in your area and while they're helping you with the language you can be helping them with other things, maybe tap into Students of The World: Penpals from Spain - make Spanish friends - penfriends for kids, students, teachers
to pick up Spanish e-pals where you could get a bit more used to the language and make more friends (exercise usual internet safety with that though!!).............
But either way, allow yourself to keep your options open, hey?? Don't go restricting yourself

Alison