You are using the ETA fee estimator, if you change it to Static, you will be able to move the slider to 1 sats/vByte, but when you use ETA, your wallet software will suggest the best fee rate that can get your transaction added into the next mined blocks based on how congested or free the mempool is. So if you want to move the fee rate to as low as 1 sats/vByte, change it from ETA to Static, and use
https://mempool.space/ to choose your priority.
Take note that the total amount in fees you will pay is based on the size of your transaction. On estimate your TX with fee rate of 21.4 sats/vBye will get your TX in a block within 25 blocks, so if you change it to Static and use a lower fee rate, you may wait longer and even have to use rbf to bump it.
The fee estimation is rather accurate tho, and lower than what it tells you is probably going to be purged, when the average fee is 100 sat/Vbyte and someone broadcast a transaction of 1 sat/Vbyte, why should I keep that on my disk, to begin with? I have limited capacity and computation power, I need my mempool to be as small as possible, filled with the highest bidders, you send me a 1 sat/Vbyte I will get rid of it right away, so will do the others, this way, your wallet might be showing pending confirmation where in reality none of the miners sees it, it's stuck forever.
when they are Mining the high transaction fees from the ETA they should also put in mind on the transactions on the static queue. Even if it is 20 to 24 hours at least there will be hope for the poor.
I want to clear up some terrible misunderstanding here, the ETA and STATIC only exist on your wallet UI, in fact, most wallets don't even use those terms, but whatever, miners don't see that, they don't know what wallet you used, they also happen to not care about all that.
Every miner has his own mempool (another general misunderstanding by the majority of people thinking there is some called THE mempool), as a miner, how do I fill my mempool? people broadcast their transactions from all different locations, wallets, and exchanges, now let's assume you use Electrum wallet, and your wallet is connected to a node, when you create the transaction, and sign it, the wallet will tell the node about your transaction, the wallet node will tell the nodes nearby, the node nearby will tell the next wallet, so you broadcast a transaction from Calrofina, my node (as a miner) is in Singapore, it eventually arrives to my node, I then have to check it against the current transactions in my mempool which can only have store 10 transactions, but the block is limited to 2 transactions for an example:
TX 1 > paying 10 sats
TX 2 > paying 8 sats
TX 3 > paying 8 sats
TX 4 > Paying 6 sats
TX 5 > paying 4 sats
....
....
TX 10> paying 2 sats
now despite the fact that it's my own mempool and I fill it how I like, it's probably identical to 99.99% of the other mempools that are owned by other miners, not because we know each other, but because it's only logical to do the thing that gets you the most money.
So now, comes your transaction paying 1 sat, given that my mempool is full, I won't even store yours, I still have 10 pending transactions that need 10 more blocks before I run out of transactions, your transaction which I don't know where it came from or how it got it's 1 sat fees, is just useless as far as am concerned.
Ok if I could store 1000 transactions, I will do this
TX 1 > paying 10 sats Prioty 0
TX 2 > paying 8 sats Priority 1
TX 3 > paying 8 sats Priority 2
TX 4 > Paying 6 sats Priority 3
TX 5 > paying 4 sats
....
....
TX 10> paying 2 sats
TX 998> paying 1 sat
TX 999 > paying 1 sat (from Agbi) Priority 1000
but then a new transaction is broadcasted paying 11 sats per Vbyte, what will I do? I will delete yours if I have no space left, bring the priority of every transaction 1 bit higher, and put that 11 sat on top.
All of this happens without knowing what wallet or settings were used, I just know how much every transaction is going to pay, and that's all that matters as a miner.
