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?
Whether you want to use all your funds to buy at once or divide it and start to buy in bits depends on your strategy and if you are a trader or investor. Buy in bits if you are aiming for short term profit or you can decide to buy in lump sums if you are investing for a long term. Cryptocurrencies are volatile and it is not advisable for traders to use all their funds to place trade at once so if they lose they will have reserve funds to trade again. But if you're a crypto investor specifically Bitcoin you can buy anytime when you have the funds or you can do DCA method because Bitcoin has the potentials to always reach ATH and give you profit.