solid numbers are sometimes not so easy to find - you should presume that any number in crypto that could be faked is being faked - but there's clearly been a serious decline.
Coinbase reveals in 10-K and 10-Q filings how it's lost over 75% of retail customers, i.e. the guys who supply the scarce actual dollars to crypto.
CoinDesk has been running regular articles on how it's down, e.g.
* https://www.coindesk.com/markets/2023/06/15/crypto-trading-v... - "Average daily volumes for the second quarter of 2023 were $10 billion for the top 10 tokens (excluding stablecoins), compared to $18 billion average daily volumes in the first quarter of the year."
this is important, because a thin market means the price is more easily fakeable. The TrueUSD stablecoin seems to have lost its backing recently, but simultaneously with that Binance somehow printed $2b worth of TrueUSD. What could you do to the bitcoin price if you had $2b of fake money to do it with?