Most of the time we regret buying something when we see the price drop. Then we don't have any more dollars to buy. But if we divide our total dollars into three or four parts and buy slowly at each down, then the chances of profit are high. And if we get profit after buying first, then we will sell. For this reason, I think it is better to invest little by little instead of investing all the dollars at once. What is your opinion?
I think what you are trying to say is related to usually discussed DCA strategy, and which has been the most effective way to buy and build up your crypto portfolio over a given time. There's a always going to be an opportunity in the market to stack some stats and for a long term purpose. Except if you have an allocated funds towards buying of your Bitcoin, each week and month you can buy with whatever funds you have at the moment, but let's say you have a budgeted funds of about $500 and not knowing when else another funds are going to come in, then splitting the money to buy in phases is highly recommended.