Tips for Realistic Stone Ashlar and Rubble Masonry Materials?

I’ve been involved in D5 for past 9 months or so, but the major of work is placed in the stone temple, the assets materials are not fit and modifying them doesn’t get it any better

Need help regarding the same.

Also noting the fact, I’ve been matching stone material available to the local context of the site, which is crucial for our representation, Need Tips regarding this too.

PS: I’ve added actual site images of the Stone and the types of masonry style I’m looking for in general.

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You should probably look for quixel assets and materials…
Hope this help