What do you think will happen tomorrow with the BTC (up or down?) if the stock markets worldwide crash again?
If this happens globally, like the previous crashes, it will definitely affect the crypto market, but that is only temporary because yesterday we can see a pretty good development in the crypto market, while the stock market has not fully recovered. So don't worry too much, the crypto market will surely recover in its own way.
I am afraid that the BTC will then go towards 3k or even less. The altcoins will hit it even harder.
I dont know what i should do today, sell all my altcoins?
If you're scared, just wait and see until there are good signs, but make sure you are not late and have done a maximum analysis. Discussing with experienced people about it will be more effective than asking random opinions.