In the fickle, fleeting world of social media, your relevance is closely related to your activity level.
Make sure you fine-tune your presence on LinkedIn and post updates regularly - but not so often that you start annoying your contacts.
The optimum number of posts on LinkedIn is one per day. This number seems to strike a perfect balance between the informative and the annoying.
See more in the Social Media Frequency Guide: https://blog.bufferapp.com/social-media-frequency-guide