I don't think there is anything to be done at this point (besides using development funds to pump the price via buyback and/or marketing towards token speculators). Newer ICOs might learn from the mistakes of those in 2017 and early 2018, though most probably will not.
Personally I both invested in the ICO and bought a lot more after the price plummeted.
Coin distribution in the middle of the biggest crypto downturn was rather unlucky too.
All they can give us now is just apologies or acting in a way that might turn off potential business partners and at the expense of development funds (hypemarketing towards crypto speculators or manipulating the price of their own token through buybacks).