John Gill Commentary Numbers 29:39

"These ye shall offer unto Jehovah in your set feasts, besides your vows, and your freewill-offerings, for your burnt-offerings, and for your meal-offerings, and for your drink-offerings, and for your peace-offerings." — Numbers 29:39 (ASV)

These things you shall do to the Lord, in your set feasts
Or rather in the times set and appointed to you, as the Jewish writers

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besides your vows, and your freewill offerings :
which might be offered up at any time, notwithstanding the above sacrifices, which were necessary and obligatory; but these were at their own option:

for your burnt offerings, and for your meat offerings, and your
drink offerings, and for your peace offerings ;
of which see (Leviticus 7:11–16) .

FOOTNOTES:

• F15: Maimon. & Bartenora in Misn. Pesach, c. 7. sect. 4. interpret it; and so Jarchi interprets it of a fixed time, which seems better; since these were not all feast days, on which the above sacrifices were to be offered, for one of them was a fast, even the day of atonement: