Years ago, Poloniex was the biggest crypto exchange, especially when we mentioned about margin tradings. Since the middle of 2017, Poloniex fell behind Bittrex due to their bad supports for customers, and KYC verification to increase daily withdrawal limits, or maybe some other reasons were not disclosed publicly. After that, Bittrex took over by Binance, that has still remained the biggest exchange so far, and Poloniex fell further behind them.

Fortunately, things likely improved with Circle partnerships. During recent months, lots of things improved on Poloniex, graphic designs, customer supports, and recent days, we have had more coins added to Poloniex's Margin Trading Market. For years, Poloniex maintained its marginal tradeable coins with very limited, and old coins. So, I think it is a big change of their strategies.
It is too soon to say anything, but I am a big fan of Poloniex, and, of course I hope them will come back, to the top exchanges, from this year to 2021.
Some snapshotted images about their announcements and new marginal tradeable coins recently added on Poloniex:
Furthermore, I hope daily volume on Poloniex will increase dramatically with new coins added to their Margin trading list.
https://coinmarketcap.com/exchanges/poloniex/

How about your thoughts with the latest improvements of Poloniex?