This is what I've been saying (see following thread post) for internet ages (before my "red book"). You don't need permission to improve yourself and lead others by example. Choose those most likely to be open to your influence, and spread interest gradually and organically.
In efforts to improve by using #DDDesign, you'll just upset the apple cart if you try to go all in and lead a rebellious anarchy.
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Oxford: anarchy 1. a state of disorder due to absence or nonrecognition of authority or other controlling systems.
First just replace "primitive obsession" with concept-clustering Value Objects in one entity, with new tests that visually prove the benefits (reasoning-enabled immutable concepts). Don't add it on your team backlog/board or even say a word. Just set the example by improving when you see a clear need, and "primitive obsession" is a clear need ~100% of the time.
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(Say not when using cache-line byte alignment for main memory read/write performance, which is super hard to get right anyway, and almost never used in LOB apps/services.) Then improve another entity.
When any uproar occurs, calmly point the complainers to the practice of taking responsibility to improve code and refactor to clearer understanding as part of disciplined agile (adjective) software development.
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You're simply applying a "good practice," which again is almost always a "best practice." Demonstrate in tests how immutable whole concepts prevent bugs and make code more understandable, and are even more secure (/cc @danbjson ). Some will listen and follow your lead, which is self-organizing positive anarchy.
Oxford: anarchy 2. the organization of society on the basis of voluntary cooperation, without political institutions or hierarchical government; anarchism.
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When that's out of the way, start improving Modules along with continued entity improvement.
If you can't do this in short order, along with a typical task assignment, only replace primitives of one whole Value Object concept at a time. Or do it while you eat lunch. (Okay, that's me, but maybe not you.)
Wikipedia: "Since its conception, anarchy has been used in both a positive and negative sense, respectively describing a free society without coercion or a state of chaos."
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In three words: Just do it.
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Vaughn Vernon 🟦 🟨 🟧 🟪