Then your profile sucks. Mine did, too.

I made my profile look like my resume. And then tweaked it until the inmail I got was for jobs I wanted.

Part of it comes down to knowing how to write a good resume, the other part is gaming the keywords so your profile shows up in a good recruiter's results.

I still responded to every single message though because I'm pretty sure engagement metrics makes you more/less visible to prospective recruiters.