The uncomfortable truth is that it was Palm Sunday to First Fruits that created a holy week—holy because of the Feasts of Passover, Unleavened Bread (of which the first and seventh days of this second feast are high-day Sabbaths; the first 2 of 7 annual HIGH HOLY DAYS/annual High Sabbaths), and First Fruits (Resurrection Sunday). Most important is the fact that the Feast of First Fruits came after this true holy week’s regular weekly Sabbath ended! These holidays/feasts and Holy Days are God established, as commanded in Leviticus 23!
Rosh HaShanah isn’t just the Jewish New Year. There can be no doubt that all of the idioms, names, themes, and images for Rosh HaShanah are why this feast day not only is a High Holy Day but also an extremely important holiday for Jewish people, indeed, for all mankind.