How to have infinite cards in a deck? Instead of 25 card limit?

I’ve been trying to figure out how to make it so I can combine some of my custom decks together or have more than 25 cards in the deck in AOE 3 DE, however, all the google searches that I’ve found that do this only work with the original AOE 3, not the Definitive Edition as I have already tried going into my saved games folder and changing the XML file, it just reverts back the save as soon as I launch the game so I’ve been stuck with 25 cards per deck, no matter what I try.

Could anyone make a mod, or tell me how to mod the game so that I can combine to have say a maximum of 70 cards per deck, or how to simply combine my decks into one in AOE 3 DE?

Thank you very much.