I think LinkedIn has changed quite a bit the last couple of years, especially since covid hit.
I actually got (potential) clients with linkedin but I post regularly and always try to create some value in my posts. At the moment, it's my main marketing channel. This isn't ideal in the long run because it makes me highly dependent on the platform.
Regarding the feed, it just takes work to keep your feed clean. I only follow people who are actually related to my work or engage regularly with my content. People who post work anniversaries, selfies, and other junk will be removed after one or two occasions.
How do you get clients for your freelancing if I may ask?