One problem can't solve from first, if new investor can't trust new fresh coin why they don't invest in old coin. We several good coin already exists in cryptocurrency even with very low price. Even I don't think there could be a trust problem. All solution is now is the correction time!!
maybe investors are waiting for the right time to invest, because now the situation is not stable, so it makes investors still afraid to invest in cryptocurrency, but I'm sure when the market begins to recover and return to increase (market conditions are the same as in 2017), then investors will re-invest in cryptocurrency to earn income from investing in cryptocurrency.