Consensus won't create great ideas. Basically, a good investment idea is pretty unusual and has to be a somewhat lonely insight. If the merit of an idea is visible to a lot of people, it quickly cuts into the price.
Avoid popularity. It has many snares, and no real benefit.
Many of life's failures are people who did not realize how close they were to success when they gave up.
Price is what you pay. Value is what you get.
Wide diversification is only required when investors do not understand what they are doing.