+1
Could also consider extending the unlock system further. I believe the last unlock is at 10,000 Discover Points for access to the Draconic Site.
What I would further suggest to this idea would be to add higher tier unlocks (e.g., increments of 10,000 after unlocking Draconic) where you unlock another spawn tier for a particular site.
Example below for demonstration of unlock increments. The Pokemon were meant to fit the theme of the site and not necessarily what I think should be the spawn added. Mainly focused on mons or fossils that I thought aligned.
Haunted (20,000) - Charcadet spawn added
Mineral (30,000) - Minior spawn added
Feral (40,000) - Paldean Tauros spawn added
Glacial (50,000) - Bird and Dino Fossils (allowing the unlock of Arctovish, Dracovish, Arctozolt, and Dracozolt)
Natural (60,000) - Toedscool spawn added
Historical (70,000) - Passimian spawn added
Wondrous (80,000) - Impidimp spawn added
Briny (90,000) - Basculin (white stripe) spawn added
Draconic (100,000) - Dreepy spawn added