I think Raven is stagnant and now falling because it has become a coin too big to be solely on Crypto Bridge. The buyers absolutely dominate, it's very frustrating since I've been mining since late March and thousands of dollars of equipment dedicated on Raven, but I don't see it growing. Has any developer made a pitch to Bittrex, Bitfinex or Cryptopia? Even Binance, RVN just broke into the top 100 on Coin Market Cap, it's not a secret cool coin anymore, but in Crypto Bridge buyers own the game because it's a low value coin and miners can only get so much. Anyone sees this too?
There have been many community members who have reached out to various exchanges such as those you mentioned. The larger exchanges all have similar roadblocks to listing raven, which those community members are in the process of working through.
For more information on the efforts made by the community towards exchanges, feel free to check out
https://raven.wiki/wiki/Exchanges