For day trading I used to take my daily profit. And always keep a fixed amount for investment. Sometimes I don't face any profit in day trading and even if the loss is small, cause I currently use Binance's stop limit option.  So that in case of loss, I can recover it later.  It has happened to me many times in the beginning that after seeing some profit, I re-invested with that profit and then faced a good loss.  So currently I keep a fixed amount for day trading from which I can spend my hands with profit.