Before I see what version "21w38a" has, let me tell you what it should have.
I want to see diabase(wiki: en.wikipedia.org/wiki/Diabase) in the game which can be crafted into: ["Reinforced Chainmail Armor", "Reinforced Chests", "Diabase Doors"]. I would like to see a new "Properties" path for data. I even thought of the ability to make custom options with resource-packs. The desert pyramid should also be updated like this data-pack(link: drive.google.com/file/d/1nGVQs3W2o2UxcG811mrjuBTCa40lYnVG/view?usp=sharing) I created but was never even came with it's feedback.