There are two opportunities that I often hear from people to analyze a coin, both of which are almost completely true if I pay close attention. First, when the coins are issued, usually in the next 2 or 3 months they will slowly rise. Second, this moment will be repeated once again, but not for long.
Sometimes keeping too long a coin also doesn't mean anything, considering that every coin has the right time to be at the maximum number, but not all coins have this opportunity.
Strong fundamental coin usually have slow paced of developing their project, just like ETH which planned ETH 2.0 since 2 years ago. But this kind of coin is having a strong fundamental and solid holders behind, so the price won't crashed just like other coins which has roadmap to fully operated in just 1 year development.