The overflow of gratitude is joy. Realizing God’s abundant goodness, even in the hard, is a gateway for joy. Psalms 126 shows this so clearly as the Hebrew exiles sang their thanks to God for bringing them back to Israel.
Psalm 126:1-3
When the Lord brought back the captivity of Zion, we were like those who dream. 2 Then our mouth was filled with laughter, and our tongue with singing. Then they said among the nations, “The Lord has done great things for them.” 3 The Lord has done great things for us, and we are glad.