Day traders risk a lot now - the market situation changes so fast that you can be simply not in time to complete the operation you start. It will be better if you hold your crypto.
That's the whole point of day trading. Take advantage of the market when the price changes instantly. If you chose a coin that moves sideways within the day, most likely you will not earn a lot from that, so you chose the one that is active and and has high volume so you can take advantage of the price surges. Once it reaches your target, Sell.
Do not be greedy in determining the sales target, as long as it is profit, make it a habit to be satisfied and do not try to sell at a price that does not make sense unless you are absolutely sure.