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!!
Look at the IEO projects that succeed in 2019, they succeed because they have something new to offer crypto space, investors have every right not to trust any new projects because of the damaged done in ICO era, to gain investors heart they have to deliver or leave
But in 2019 many IEO projects were unsuccessful. There has been a lack of trust so far because many projects have failed, especially in 2019 which was a bad year for investors because of the many problems faced by crypto.