A man who really liked a company called Tesla and thought it would do very well, was wrong for three years. He said this was his biggest mistake in studying companies. Even though he still likes the company, he thinks they need to be better at selling their cars by using different ways of attracting customers. Read from source...

1. The title of the article is misleading and clickbait-ish, as it implies that a well-known Tesla bull has changed his mind and regretted his previous support for the company, when in fact he only admitted his mistake on one aspect of his research, not on his overall thesis. A more accurate title would be something like "Tesla Bull Admits He's 'Been Wrong' On One Aspect Of His EV Giant Analysis, Calls This His 'Greatest Research Mistake'"
2. The article uses vague and ambiguous terms such as "fundamental problems" and "marketing tools" without providing any specific examples or evidence to back them up. It also relies on quotes from the fund manager that are either out of context or taken out of proportion, such as his statement that Tesla's management should learn to use marketing tools other than price, which is a common sense advice that could apply to any company in any industry, not just Tesla.
3. The article tries to create a contrast between the Tesla bull and the Walmart quarter results, as if they were mutually exclusive or contradictory scenarios. However, both events are irrelevant to each other and do not affect the long-term prospects of Tesla as an EV maker. The Walmart quarter results are positive for the retail sector in general, but they do not imply anything about the demand for electric vehicles or the performance of Tesla's competitors.
4. The article ends with a link to another Benzinga story that has nothing to do with the original topic, which is a common practice of clickbait journalism that tries to increase traffic and engagement by linking to unrelated content. This is dishonest and manipulative, as it does not serve the interests of the readers who are looking for relevant and informative information about Tesla and its industry.

- Buy TSLA at its current price of $698.25, hold for 3 years or until it reaches $1000 per share.
- Sell all other EV stocks and focus on TSLA as the leader in the industry with a strong moat and competitive advantage over rivals.
- Diversify your portfolio by investing in other sectors such as renewable energy, autonomous driving, artificial intelligence, robotics, and biotechnology to benefit from the synergies and cross-sector opportunities.