There is a massive hidden feature in pain sight on LinkedIn:
When LinkedIn tells you X person also commented on a post - that is a sign of active people that LinkedIn recommends to engage with. These are the most active members on the platform.
Comments are king as they show up like posts on people's feed and people comment much more easily than post.
You should connect with these people over the "people you may know" who are among the bottom 99% of inactive users most likely.
You have a weekly limit for connections so make them count.
Only one thing matters long term:
Quality>Quantity