Actually the method is very simple. After putting some assets into the wallet, leave your assets there without doing anything for a long time. Then you can check the portfolio again when the time is right to sell it, believe me patience very often ends with a smile.
Simply put, ignore market volatility and store those bitcoins in recommended wallets.
It is hoped that holders will not be affected by market fluctuations for various reasons, and it would be better if they consider investing and accumulating as much as they can afford.
If you feel that there is a possibility that the price will decrease, then DCA is worth considering. But whatever it is, if this investment projection is for the long term then they should ignore price volatility.