You can choose to unfollow someone if their noise outweighs their signal, otherwise you just put up with it. Eliminate inline "cards" so they can't force 3rd party content into your stream. If they post a bunch of stuff you don't want to see you can unfollow - there is no way for anyone to force stuff on you.

You discover content by people you follow posting links to content, and by search. Good content will gain a following, as it always has even before feed algorithms.