You should choose the crypto coins or tokens that meet your trading criteria and have the best profit and risk-reward ratio potential. Avoid the crypto coins or tokens that do not meet your trading criteria or have a low potential for profit and a high risk-reward ratio. You should limit the number of crypto coins or tokens in your watchlist to a manageable amount you can monitor and trade effectively. You should prioritize the crypto coins or tokens in your watchlist according to their importance and relevance for your trading strategy and goals.