Create an advice wall/book/collection. Ask lots of older married couples for tips and thoughts helpful throughout marriage. Record them all. Every anniversary, read through them and see the new purposes and relevance they hold in your marriage.
An amazing idea: Write love letters to each other and place into a box along with a bottle of wine. Nail it shut at the wedding. When you have your first big fight, open it up, pour the wine, go to separate corners, read the love letter & remember