According to
https://bitcoinfees.21.co/, it needs 420 satoshis/byte to get fast confirmations. Anyone know why the fees are going higher and higher?

Core developers must be focused on this issue, 200k unconfirmed transaction base here
https://blockchain.info/unconfirmed-transactions is really intimidating.
And maybe before the price reach 2k, the price will be more than 500 satoshis/byte to get faster confirmation. And of course, Fees will be more high and higher until... I don't know what will happen soon.
200k unconfirmed transaction, it's crazy, no wonder the fees are so high.