I'm not a trading expert, but I just want to share tips that I used to do.
First you have to divide your capital into 3 parts, do not spend on just one kind of coin. Secondly, your money is intended to buy coins at the actual price, the price below, and the price below it again, functions as a backup of your money that will be useful as an accumulation of the totality of your money. If you want a fast profit, then follow the trend or can choose coins that are currently high in volume and are in a bullish trend, this can be you get information from the trading discussion. And then you should prepare yourself mentally because the possibility of 40-50% of your money can disappear in an instant, Do not leave your trading screen if playing fast trading in order to cancel an order. Maybe that's just the tips are useful.
Rather than keeping a close eye on your trading screen, I recommend setting a stop loss while setting a sell order. It will help limit loss when the coin dumps massively for instance. However, you mentioned accumulating the coin you want to buy as it dumps, which is a very good strategy, and it works for me. For example I divided my funds and have 500$ to buy NEO and its current price is 10$, firstly I buy with 100$ out of my 500$, then set another buy at 9.5$ and also 9$ then watch the market.