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One LinkedIn post turns into seven sections and two hours because you're trying to make a movie. Make sitcom episodes instead: one queue that was the wrong choice, one boundary developers get wrong. The larger story tells itself.
You don't post on LinkedIn to become a content creator. You post so that when someone asks 'do you know a developer who can handle this?', somebody thinks of you. It's a long game, and it beats the resume line.
NDA, clearance, or a company that won't let you talk about the product? You don't need to. Every project is full of decisions that aren't the project, and how you made them is what a senior dev or hiring manager actually wants to see.
The most common thing developers tell me is they don't know what to post on LinkedIn. You fixed something this week, made a tradeoff, screwed something up. That's the post. Write five sentences and hit publish.