we have entered the bearish season 2022/2023, of course volatility in altcoins will also be higher, Pump and Dump will occur,
because altcoins will follow the movement of Bitcoin prices,
The prices of altcoins don't always follow the movement of Bitcoin price. Sometimes the price of an altcoin can increase because of good news from that altcoin, for examples: there is a new sponsorship, burning program, or new product made by the project team. These are just some examples that can make pump of altcoin prices without the influence of Bitcoin price. Although the price of Bitcoin is decreasing, the price of that altcoin can increase if one of those examples is happening.
Only a few altcoins can go against Bitcoin and market trends. Good news like you said altcoins might bump its price for a short amount of time but eventually the price will rise and fall similar to Bitcoin and the market. That's why don't have too much hope for upcoming good news for an altcoin, you might fall under a pump cycle because of 'priced in' to anticipant it.