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!!
You still have to do your research if you want to invest in already existing coins. the same is applicable to top coins. So, it is not as if they do not invest in them and not that they will not, but everyone is now taking his or her time to ensure that the right thing is done. Gone are the days that investors jump into conclusion. Logical thinking is required and you must do that with some pieces of evidence.