To get even more engagement from your post, don’t include a link within the actual update. Right now, LinkedIn is favoring content in the feed that’s free of links (indicating promotion of something), so mention in the last line of your update that the link to your post where people can read more will be in the first comment—and just paste it in there after posting the update.
Look for a point of diminishing returns. Where are your campaign investments providing value? At Marketo, inbound strategies like content marketing are the strongest channels, and should be maximized to a point; but beyond that, inbound tactics need to be supplemented with outbound, paid channels in order to create sustainable demand and generate new leads from your website.