The Feast of Tabernacles is also the time where we are called to bring our tithes from the harvest to the temple, it’s a time of declaring that all we have is belongs to God. When all we have is dedicated to God it allows God to bless it and us.
Also on the fifteenth day of the seventh month, when you have gathered in the fruit of the land, you shall keep the feast of the Lord for seven days
We get to worship God with the fruit on our table and the branches of the trees.
And you shall take for yourselves on the first day the fruit of beautiful trees, branches of palm trees, the boughs of leafy trees, and willows of the brook; and you shall rejoice before the Lord your God for seven days.