Quick answer
Turn a LinkedIn post into an image. Counts against the 3,000 character limit, and shows the whole post without the see more cut.
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Everything after that sits behind a see more link, and most readers never expand it. An image shows the whole thought without asking anyone to click.
The card scales text down as the post grows. A 3,000 character post will render, but it will be small. If it is that long, split it into several cards.
On LinkedIn the line under your name is the headline, not a handle. It is the credibility line, so use the one people would find persuasive rather than your job title by default.
LinkedIn document posts are effectively slide decks. Making several cards from one long post, one idea per card, is how most of those carousels are built.
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LinkedIn allows 3,000 characters and shows about 200 of them. Everything else is hidden behind a see more link that most people scrolling never press. If you write long posts on LinkedIn, most of your writing is not being read.
An image does not truncate. The whole post is visible at a glance, and image posts take up more vertical space in the feed than a collapsed block of text does, so they are harder to scroll past. That is the practical reason text cards are so common on LinkedIn.
There is a limit to this. A card can only hold so much before the type gets too small to read on a phone, which is most of LinkedIn traffic. The tool scales text down as your post grows, and past a certain length the honest answer is to split it into several cards rather than shrink further.
That splitting is how LinkedIn carousels get made. A document post is a slide deck, one idea per slide, and each slide is a card like the ones here. Making four cards from a long post is usually more effective than making one dense one.