Predicting when altcoins might suddenly increase in value isn't an exact science. But you can keep an eye out for certain signs and for one thing, if the overall crypto market starts trending upward, altcoins often follow. Makes sense - a rising tide lifts all boats, as they say.
So while you can't pinpoint an exact date, watch what bitcoin and ethereum are doing. And keep tabs on the latest altcoin launches or protocol upgrades. If you see investor excitement building, it likely means an alt run is brewing.
Speculation is quite handy if you truly know the alts that you are holding with.
You will understand better the market performance of the alt if you are closely following their updates.
The major markets like BTC and ETH are not too hard to keep up as you can already see what's going on with their respective markets.
However, when it comes to most alts, you need to subscribe their social media platforms in order to learn more what's going on with their project.