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(Bloomberg Business) — Chris Sacca, an early investor in Twitter, has been perhaps the biggest advocate of the company. Now, he’s ready to speak his mind.

Sacca, an investor with Lowercase Capital who says he still owns “a lot” of Twitter stock, explained in a blog post on Thursday that he has cheered the company on for nine years without expressing his thoughts about what needs to change. “I haven’t been as candid as I could be in public discussions about Twitter,” Sacca writes in the blog post. “I am soon going to post a few things that I personally hope the Twitter team will accomplish.”

Twitter, which became a public company in November 2013, is dealing with slowing user growth and sales. The product is awaiting improvements that may take a while to drum up a larger audience, if they do at all, and the ad sales team is finding that a strategy that worked for more than four years is in need of change.

While Sacca is taking off the kid gloves, don’t expect him to turn into an enemy. He describes Twitter as a “great investment,” and says “the stock is cheap.”

To contact the author on this story: Sarah Frier at sfrier1@bloomberg.net To contact the editor on this story: Mark Milian at mmilian@bloomberg.net