"Let no one therefore judge you in food or in drink or in respect of a feast day or of the new moon or of the sabbath days, which are a shadow of things to come, but the body is of the Christ."
(Colossians 2:16-17)
Paul does not speak of God's feasts and sabbaths etc in a negative way, but gives liberty to the believer about embracing/practicing them. For he said the truth in them points to the Christ; a revelation of who Jesus is - what He has done, and what He will do in the future. For they give us a peek into the coming realities of His messianic kingdom (earthly reign), when Israel will be beautified and fully restored (Acts 1:6, 3:21), and the Jews will lead the nations in worshiping Him, on Mount Zion; fulfilling God's original purpose for Israel through the reign of Jesus!
“Thus says the Lord of hosts: ‘In those days ten men from every language of the nations shall grasp the sleeve of a Jewish man, saying, “Let us go with you, for we have heard that God is with you.” (Zechariah 8:23)
"And it shall come to pass that everyone who is left of all the nations which came against Jerusalem shall go up from year to year to worship the King, the Lord of hosts, and to keep the Feast of Tabernacles." (Zechariah 14:16)
"Many people shall come and say, “Come, and let us go up to the mountain of the Lord, to the house of the God of Jacob; He will teach us His ways, and we shall walk in His paths.” For out of Zion shall go forth the law, and the word of the Lord from Jerusalem." (Isaiah 2:3)