I've seen crypto commentators and crypto news outlets commenting on retail participation being much lower than before but I don't have a clue how to check it at source.
And why there had been much commentators and news deviating from the interest of the retail investment sector is the insight of investors being able to understand that investors can only make fortunate profits on Bitcoin when they holds for a long term and also inspires accumulating strategy. I think the trend will help consoling short term investors not to take control of their emotions that drives Fomos.
For exchange that gives statistics of retail investors is what I don't think it's possible.