Hallmark holiday innit.
Keep it simple, do acknowledge it, but do the same thing every year - Bowling and curry - because it’s what we did on valentine’s day before when we were just friends.
Her Birthday is 6 days later and our anniversary 16 days after that, so we do more for those things anyway.
Card in the OP is fine, prefer cynical to overly schmulzy fake bullshit. I normally get as offensive a card as possible then write something actually from the heart inside it.