When expressing gratitude or appreciation for a past occasion, there are a variety of ways to say "thanks again for yesterday." Some synonyms for this sentiment may include "thanks once more for yesterday," "thank you again for yesterday's kindness," or "thank you once again for yesterday's gesture." Other alternatives may include "I'm grateful for your help yesterday," or "I appreciate your generosity yesterday." No matter how you choose to express your gratitude, taking the time to genuinely acknowledge and thank those who have helped us in the past can have a meaningful impact on our relationships and connections with others.