There is nothing needed to be done to restore confidence in cryptocurrency because crypto always fix its problem in time now investors are more wiser and even the scared ones that leave ICOs behind took the IEO train instead so the puzzles are been set
The more time the crypto-currency market has, the more firmly it stands on its feet, the problems are gradually solved, which is clearly seen in the example of ICO and IEO, there is no doubt in the crypto-currency and you should always work with full faith in a good future