MY trades are 80 to 90% effective, I do not say that they are 100% because it would be lying, the idea is to add profit, the altcoin are to speculate with them, buy one level is sold in another and look for another Altcoin, stay with the altcoin for a long time can be a very serious mistake, so I happened in 2018 and lost a lot of money, when the owners of the projects sent us to HOLD they sold the coins at the highest prices, you learn to know the system after more than 2 years of hitting.
Its all speculative even the best ones doesn't guarantee 100%. Signals are good but the market will always act like how the market will act and if there are fundamental news coming, it will be interrupted and the market again will react. Buying altcoins can be good if you are one of those who will be at its bottom price.
If by any chance there is some new from any of the official source about the cryptocurrencies then it could 100% affect the price for the markets. If there is some good news then we can surely expect the bull markets to come but if it turns out to be some bad news like any government banning exchanges, etc then the price for altcoins may fall so the price for altcoins depends entirely on the market conditions.
Signals can make them visible but can't actually predict the price for any coin. Relying on any of these signals can lead in loss so we should only follow any of these signals on our own risk. Lastly, buying as much altcoins as possible and holding them for long term can be good investment for now.