Being a holder doesn't necessarily mean just buying at any point. It also requires timing and looking at market conditions whether it has a good long term potential or not. For example, I wouldn't buy Bitcoin until it successfully breaks above $10,000 to confirm that the uptrend is back on track.
When I have bought it and market becomes little shaky I hold the coins and see for few days which way market would make a move. So if it a temporary phase and market sliding then I would hold the coins and let the market revive in coming days which will be a better than exiting the position and become a pert for the fall in the market