You're late to the party lol. The reason they went down from being the top exchange some time in 2017 was because they suddenly enforced KYC among users and prevented withdrawals of many accounts. I remember some migrated to exchanges like Cryptopia but most of their users moved to Binance as they don't immediately ask KYC unless your withdrawal is 2 BTC above.

Suggestions? Binance for the same reason stated above. If you have submitting private information, you try Bisq DEX and other P2P platforms. Just remember that they don't have the same liquidity that centralized exchanges offers.