Hey OP, just wanted to add here more mempool viewers and fee estimators

1. https://btc.bitaps.com/ (under the mempool analytics section)
2. https://www.buybitcoinworldwide.com/fee-calculator
3. https://www.blockin.com/stats/unconfirmed-txs
4. https://bitcoiner.live/
5. https://btc-fee.net/
6. https://spookiestevie.com/bitcoin/
7. https://bitcoinfees.net/