Chances are that yes you are doing something wrong...if you goal is to attract recruiters. Linkedin has some secrets just like any other platform and one of them is that recruiters tend to like 2nd or 3rd level connections so that they can see who you network with.

There are also ways to add keywords to your profile that make it easier for them to search by certain competencies or experience.

The number of recruiter requests that I get has increased steadily as I have increased the size of my network. Once you hit over 500 connections it seems to be a tipping point.

There are some other settings that indicate that you are open for conversations on hiring, business opportunities etc - that make it easier for them to contact you. Good luck.

Put your email address somewhere in your profile and you will get people contacting you, most people do it like emailadd [at] something [dot] com, etc to keep the most simplistic bots from spamming. You will get a bunch of crap messages but it at least gets a lot of people to add you, etc.. its worth it if you want to grow your network, I had mine on there for a while but then got tired of the noise so I took it off and have noticed messages have slowed down considerably.