Shitcoin will go down fast if:

-do not have use case (working platform) which spend same shit coin in amount close or above daily coin production

-is not listed in at least one exchange with steady daily volume (real volume, not bot trading -> to many green buy transactions which are all fake)

-has realistic reward scheme after presale ends, so it do go to hyperinflation - anything above 100% yearly will not stand

-real team members pictures and linked-ins do not mean a thing, they all can be faked and i saw to many projects do that (bitcoin do not have real team members)

-company registration means nothing, more than 1000s 2018 ICO scams all have companies, some of these companies are still operational, but they just took eth and play ghost

-If it is token and offer financial services and it is just utility token not security one, than avoid in large circle since SEC did not approve it

-if it is coin with own blockchain, that blockchain should work without need for constant update of client unless use case is wallet itself - otherwise in most of cases, coin is payment for coin use case platform and it just should work in send/receive/store/pos and hold masternode collateral's if it is masternode.

Those are some rules, not all ,and major problem is that sometimes some shitcoins do perform very well at start since good marketing, and than fail.

Another problem is even worse, there are some good coins, with all good parameters but just either unlucky or with not good marketing so they stay undermined and not in expected levels for years.