Avoid buying a lot of those that have pumped high and strong. The pressure to take profits and adjust according to BTC is quite large.
Look for and read more information about projects with good updates.
For example, collaborations between relevant parties and any new upgrades.
Monitor RSI on the weekly timeframe.
Sometimes the pump can be very quick. You can take profits immediately and start looking for better projects. The cash flow cannot be enough to meet thousands of altcoins. Those with weak support after the pump are easily adjusted right after that. A reasonable target is enough.