Lots of options:
1) Find a company like Vintage Breaks or Burls which might purchase to put the entire set in a break.
2) Send through COMC eBay Auctions the next time they run a special like they did over Dec/Jan.
https://blog.comc.com/2022/01/01/no-...-january-31st/
You can even submit them cheaper now on this special.
https://blog.comc.com/2022/03/08/com...ion-promotion/
3) You may want to figure out which cards are more than $50, $100, 200, etc and then choose a different path for each.
4) Greg Morris would probably auction all individually.
5) Fixed priced listings on COMC. You set the price and just wait for them to sell over time.
6) Create an account over at PSA/CU and advertise that you're selling to the other people in the 1959 Set Registry that need upgrades.