Bought my wife some Korean lotions and other cosmetics and a bouquet of white roses. She kept the other bouquets that I've given her during our previous Valentine years even though they're all dried out now.
Dinner was at a simple Thai restaurant and had some drinks at a romantic joint where they had rose petals shaped into a heart and a single candle lit in the middle. I know I'm married but it still feels like we're dating....lol.
You guys still have the affection for each other which is a good thing. Many couple's romance dies out after several years together. Your wife still enjoy the sweetness you put upon her.