Relationships – how to apply the 90 day relationship to marriage

I am in an 8-year marriage where the connection and overall relationship has gotten very stagnant, transactional and businesslike. I love the idea of the 90 day relationship and “dating your spouse” but I am not sure how that actually works – like what are the tactical steps and practical applications? Wondering if Brooke has any tips to apply similar concepts to a marriage? Thanks!