There is no magic that can force an investor to invest in any ico, the only things that matter are quality project, competent team and targetted advertising. Alongwith these active communication by the team with potential investors is definitely a plus.
In the red market, such as now it is very difficult to conduct ICO, investors are now more profitable to invest in existing coins than to trust the ICO, whose reputation already leaves much to be desired, I think that now it is better to wait for the time for the ICO, when the green days return, investors will have the means to invest, then they will start selling bitcoin and altcoins and invest in ICO.