All of these are referring to sabbath days, but you (and Paul) missed one delineation of time:
WEEKS
The word used to refer to the weekly Sabbath in the OT is sometimes translated as "week," if my memory serves me correctly. Yes, this is a pesky point of contention in Isaiah 66:23, as some translations say "Sabbath" and others say "week."
And again, the weekly Sabbath points back to the event of earth's creation, not forward to Calvary ("shadows of things to come"), Hebrews 4 (which is about Heaven, anyway) notwithstanding.
By the way, when you have to resort to the Greek translation of the OT to try to prove a point, it's just weak.
The points were not weak at all and the old testament did a great job of clarifying the point I was making, but some just refuse to see it and continue to remain on the old covenant plantation.
When God wants to refer to the whole system of Jewish holy days, rather than name them all, He would refer to the yearly, monthly and weekly as representing the whole system. SDA's typically argue that the Sabbath Day of Colossians 2:16 is the years Sabbaths. But yearly Sabbaths were already referred to in Colossians 2:16 as "festivals". The "Year, Month, Week" pattern is so well established in the Old Testament, that Colossians 2:16 must refer to the weekly Sabbath.
Yearly, monthly, weekly pattern proves it is the weekly sabbath
1 Chronicles 23:31 - Yearly (fixed festivals), monthly (new moons), weekly (Sabbaths)
2 Chronicles 2:4 - Yearly (appointed feasts), monthly (new moons), weekly (Sabbaths)
2 Chronicles 8:13 - Yearly (annual feasts), monthly (new moons), weekly (Sabbaths)
2 Chronicles 31:3 - Yearly (fixed festivals), monthly (new moons), weekly (Sabbaths)
Nehemiah 10:33 - Yearly (appointed times), monthly (new moon), weekly (Sabbaths)
Isaiah 1:13-14 - Yearly (appointed feasts), monthly (new moon), weekly (Sabbath)
Ezekiel 45:17 - Yearly (appointed feasts), monthly (new moons), weekly (Sabbaths)
Ezek 46:1-11 - Yearly (appointed feasts), monthly (new moons), weekly (Sabbath)
Hosea 2:11 - Yearly (festal assemblies), monthly (new moons), weekly (Sabbaths)
Galatians 4:10 - years, months, days
Colossians 2:16 - festival, new moon, Sabbath day.