It is never a good idea to wait to start investing. If you have a stable income and if you have basic knowledge about Bitcoin, then you can start investing immediately. A real investor will never wait for a fall to invest, those who wait for a fall are basically businesses. If you do not have an emergency fund before investing, then create an emergency fund along with the investment. So that you can protect your holdings from unexpected financial disasters.

An investor can use the fall if he wants. For example, if a person continues to buy continuously using the DCA method and if he sees a fall in the market, he can buy at that time in the DIP way.

It will never be right to sell their holdings until the investment period ends. You have to be patient until the investment period ends. Remember one quota that patience always does not cheat people but gives the best gift of good times.
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What you said about waiting for a dip is correct,it is not a good idea to be waiting for bitcoin to dip before starting to accumulate bitcoin.  Waiting for bitcoin to dip  will lead to an investor missing market opportunities instead of an investor to be waiting for a dip it is preferable to start with DCA strategy since it doesn't involve waiting an timing the market and looking for a desire entry point. Infact waiting is not among the strategy in accumulating bitcoin so instead of waiting one can be doing DCA and still buy the dip using reserve or extra cash whenever there is a dip. An investor can decide to be using a set percentage of his discretion to be doing DCA and the remaining percentage for buying the dips, with this there won't be need to be waiting and missing market opportunities.