at that time Gwei was between 15-25 . Eth gas fee depends upon total transaction. when transactions are low then as a result the fee is also low. I remember the Gwei was come down to 12 Gwei. this usually happens in a bear market.
at this time market is bullish and Gwei is 70, you can check the USDT transfer fee is 25$.
In terms of the current size, the transaction gas fee on the ETH network is still considered large because it is measured in one transaction so it is inconceivable when someone makes a transaction up to ten times.
So in general, the ETH transaction gas fee is still unstable because the Gwei amount also changes frequently.