My wife is trying to start a new job and I want to say something like "I will always support your decision no matter what your decisions would be..." How do you express that in English in a way a native speaker would say it? I can only think of the word "support" or "backing" but cannot come up with a natural and proper sentence.
I support you unconditionally.
You could say, "I'm behind you all the way." It means I'm here, cheering you on, no matter where you go or what you decide to do.
Perhaps it might be somewhat more tactful to offer, rather than mandate, the support:
You can always count on me for support, whatever you decide.
You could say that you support someone unequivocally.
You can count on me to be in your corner and to be supportive however I can.