To be a successful holder requires firm belief and good emotional management, not to be affected by FUD and price trend changes. Choose to hold cryptocurrencies that have development potential and can be profitable, and learn proper risk management.
I would like to understand who you consider a successful holder. After all, the goal of all holders is to sell the coin at the maximum price. Only the level of the price at which they will be ready to sell their bitcoin distinguishes such holders from each other.