"LinkedIn? Oh yeah, we tried that. It didn't work." Did you really? Did you really try or give up because it's not easy?
As with many things in life and career, building a brand on a platform like LinkedIn or any social channel takes effort, commitment, and consistency.
Significant gains for your brand, your bottom line, and your career can be had by putting in the time and effort to fully understand how to develop and deliver targeted content.
So if you 'tried that' for one project, one week, one month... No, you really didn't try. You simply gave up because it was too hard and required too much effort. Or you have the wrong strategy to build your B2B audience.