HCP is right. The mempool hasn't been below 50 MB since January 7th, and as long as we continue this ridiculous bull run, it won't be for a long time yet I would think. There are probably also a few dozen more MB of low fee transactions which have been dropped in that time.
I made a 1 sat byte transaction 16 January from my signature campaign address.
https://www.blockchain.com/btc/tx/3f1c9ecba89229e7568f0a9ac01b632279ca880cec9c84a4b77b0ebaa293cf9d
we are having 1 sat/byte transaction confirmed every week...
A 50mb mempool doesn't mean you won't get a confirmation with a low fee
Now the mempool has about 70mb, but with 7 sat/byte you can get a confirmation.
In mempool.space the mempool is about 150mb, but I got only 70mb in mine. But it still shows up that it is possible to get a confirmation with 7 sat/byte
https://mempool.space/graphs#2h
I just went through the last block, i found some low fee confirmed transactions. All of them 7 sat/byte:
https://blockchair.com/bitcoin/transaction/171e66023baa035bfa43ceee08e11a320b32a7ca6629a02b43d5a11b5bc40386
https://blockchair.com/bitcoin/transaction/3af106f1707d8d126e71ca7e4889858722b93229b5ceb8d7397881b217959165
https://blockchair.com/bitcoin/transaction/a8e8ba5b6c237c5c1bce234deddda1a20b7ffd778e158aaae73f278e21fd8089
https://blockchair.com/bitcoin/transaction/c2c1ae512405e24019d43992869f83b5669e14ec3a13d4054843656d84d874f0
https://blockchair.com/bitcoin/transaction/42597d91e8ee6b7e714a5d05395a85096d9dcb3e9cda7e6ad0cee2614fc8cd1e
So, to sum up: A big mempool doesn't mean a high fee if the size is getting smaller after each block.