This thread needs a little chizuk…
After we say Dayainu, we say “al achas cama v’cama” How much more we need to be grateful to Hashem for all that he has done. That paragraph ends with the words “l’chaper al avonosaynu” (to forgive us for our sins).
The Alter of Slabodka tells us that the ba’al hahagada is teaching us an important lesson here. Look at the power of teshuva. The sea was split, we got the manna, we were given the torah, we build a bais hamikdash etc. WHY?? So that we can do teshuva!!