Long story short
LinkedIn now runs a content cleaner called 360Brew that actually reads and understands what you post.
While it was itroduced about a year ago, its strenght has become significant during recent months.
What has changed: It is now much harder to manipulate the algorithm.
ACTIONABLE NEXT STEPS
Scroll through your last month of posts from your couch with the energy of someone reviewing evidence against themselves.
Does your content actually match what your profile claims you know? Because 360Brew already checked your profile.
The topics that you mentioned in your Headline, About and Experience etc. should match topics that you are talking about in your posts.
Write your next post in the same tone you use when explaining something to a smart friend over lunch. If it reads like an AI generated press release, start over.
Rather than trying to manipulate the algorithm, focus on creating content that is truly worth reading and saving.