The first rule is that you must understand what you trade. Don't sell or buy follow market trend. It's just a scam. It can make you lose all your money.
Scam indeed but it is the most profitable one if you now how to ride with the hype and we should expect that after the huge price comes there's always a fall since most of the shitcoins are placing some good signs so that they could trap the huge fool traders. But we shouldn't look for this everyday since there are long term coins are the best to trade and might gonna bring us to top.
There is no way you can ride with that kind of hype. Most of them are just quick pumps that happens like flash and most times will just trap your funds for a very long time without having anything. Might be OK for a long term trader but not for a day trader.
As per you said, it is better to concentrate on coins with good support, easy to read trend with every possibilities of trade not going wrong. You do not have to trade all the coins, just have a list of your portfolio and work with them. It makes things easier.