John Gill Commentary Ezra 3:5

"and afterward the continual burnt-offering, and [the offerings] of the new moons, and of all the set feasts of Jehovah that were consecrated, and of every one that willingly offered a freewill-offering unto Jehovah." — Ezra 3:5 (ASV)

And afterwards offered the continual burnt offering
Not after the feast of tabernacles, as if they then began to offer the daily sacrifice; for that they did as soon as the altar was set up, and on the first day of the month, (Ezra 3:3Ezra 3:6) , rather the sense is, that after the daily burnt offering of the morning, they offered the other sacrifices peculiar to the several days of the feast of tabernacles; they never neglected that, yea, always began with it; all the rest were after it, and so on other festivals:

both of the new moons, and of all the set feasts of the Lord that were
consecrated ;
to the service of the Lord, and the honour of his name, as every first day of the month, and every other appointed festival, they offered the sacrifices appropriate to each; but not to the neglect of that sacrifice, and always after it:

and of everyone that willingly offered a freewill offering unto the
Lord ;
these they were careful also to offer in their proper time.