With nearly 500 million members in 200 countries, it's easy to get lost in the crowd on LinkedIn. The key to standing out and winning new business on the platform is to remember a golden rule of sales and marketing — the riches are in the niches! Go niche or go home One of the biggest challenges on LinkedIn is how to narrow the field of potential customers you can serve. The number one thing I've found in teaching others how to use LinkedIn to generate new sales leads, add clients and increase…