I only connect to people I have actually worked with for more than 6 months. Very few other acquaintances, roommates, family members, etc. My account is fully public. I don't pay for Premium, which is a scam. I don't connect to my own company's LinkedIn instance, for many reasons.
I do not participate in any of the social stuff. Political conversations and faux-nice-quit posts ("Hey Guys! I'm no longer with FooCorp but am sooooo excited about my next amazing adventure!") get instantly muted and unfollowed.
I one-click decline all recruiters, unless the job looks interesting. Those get a quick reply, a scan of the job description, and then a no-follow.
That alone has given me more opportunities than I know what to do with over the last decade, and zero headaches.
For a while I tried using it as a blogging platform, but I didn't have much luck. I think is more of a function of my ability to write well than any characteristic of the platform.