To reduce the cost of your total gas fee through a lower base fee, you could make your transaction on the network at a time when fewer people are using the blockchain. This is because, in a way, base fees are a representation of demand for using Ethereum. Gas fees are higher when more work is required to interact with the Ethereum network. More work is required when there are more people trying to interact with the network. Therefore, if you can find a time where there is less demand to interact with the Ethereum network, you could spend less on gas by reducing the base fee of your transaction. Weekends are usually the best time for that.