We went through this 2 years ago or so with you. The value has probably jumped a fair bit in that time too, as the memorabilia world has gone crazy during covid.
https://www.net54baseball.com/showthread.php?t=291117
Based on the last thread, its not clear what you are wanting to hear? The value was well spelled out before. I am guessing you got a slew of offers on it when you posted the pictures last time. (I guess I didn't read the latest comment close enough, you now want seller recommendations). I'm sure there are plenty of those available for the asking.
I'm sure many members here are major players in those larger auctions. You might just consider trying to come up with a price and sell direct and save yourself the auction fees. Yes, it takes away the possibility of a runaway price that is in your favor, but also thinking the right buyer will know the ceiling on a piece like this. I am not a major player, so I do not know that answer.