You haven't shown one instance of a "thousand years" being used symbolically, to support your argument. There are only two places in the bible that has a "thousand years", neither of which support your argument.
(sighs)
1000 HILLS
Psalm 50: "I bring no charges against you concerning your sacrifices or concerning your burnt offerings, which are ever before me. I have no need of a bull from your stall or of goats from your pens,
for every animal of the forest is mine, and the cattle on a thousand hills."
(What about all the others?)
BLESS 1000 TIMES (only?)
Deuteronomy 1:11 - "11 May the Lord, the God of your ancestors, increase you a thousand times and bless you as he has promised!"
(The promise to Abraham was that his descendants would be too numerous to count - are we going to completely nerf that promise and literally say they'd only increase a thousandfold from their exact numbers that day? Of course not!)
TIME - 1000 generations / forever
Deuteronomy 7:9 - "Know therefore that the Lord your God is God; he is the faithful God, keeping his covenant of love to a thousand generations of those who love him and keep his commandments."
Psalm 105:8 - "He remembers his covenant FOREVER, the promise he made, for a THOUSAND generations"
TIME in days
Psalms 84:10 - "Better is one day in your courts than a thousand elsewhere; I would rather be a doorkeeper in the house of my God than dwell in the tents of the wicked."
(This one is saying one day serving God with the righteous is better than a gazillion elsewhere - NOT 2.73 years exactly.)
1000 mixed with 10,000 - means an awful lot!
Psalm 91:7 - "A thousand may fall at your side, ten thousand at your right hand, but it will not come near you."
LIMITING the number of God's people, or expanding it beyond a mere thousand-fold?
Isaiah 60:22 - "The least of you will become a thousand, the smallest a mighty nation."
(You mean there are literal limits on God's people? I thought God promised Abraham that there would be too many, like the sand in the desert or the stars in the sky.)
Judges 15:16 - "Then Samson said, “With a donkey’s jawbone I have made donkeys of them. With a donkey’s jawbone I have killed a thousand men.”
Job 9:3 - "Though they wished to dispute with him, they could not answer him one time out of a thousand."
(Again, it's not that they disputed with him each day and only 1 person managed to answer him every 2.73 years. It's saying "not one in a gazillion" or basically no one ever answered him.)