The word shitcoins connotes a bad idea for investment, so if you don't believe in this coin and you think that these are all shitcoins then you don't invest on it at all, if you are investing in a coin it should not be a shitcoin and you don't call it a shitcoin, I never invest on coins that I will later call, shitcoin.
I will never call a coin that I hold shitcoin, if it I feel it is a shitcoin I will just let go of it and trade it to a good coin.
The word shitcoin can be understood in different ways. Judging by the answers in this thread, I see that everyone has a different understanding of the meaning of this ambiguous term.
Personally, I understand this ambiguous term as a coin having a low level of capitalization and a rather ambiguous future due to the uncertainty of demand for this coin.
The lower the liquidity of the coin, the less likely it is to be interested in it, but at the same time, the project itself can give hope and be promising enough to invest in it even with such high risks.