Only choosing lower gas price is the way to lower the transaction fee. I use MEW Android app and choose low gas fee when I made an ERC20 transaction. You can try it.
It certainly can, but the delivery will feel very slow and even very afraid of failure, because Gwei or Gas transaction fees on the ERC20 network always change in seconds, so low fees will cause very slow transactions.
Not only affects the delivery time, but the use of GAS that is too small can also make your transaction fail. The Ethereum network is still not at its best when it comes to transaction fees. It is likely that ETH 2.0 will be the solution to the problems that have plagued us all for the past 2 years.
It is still recommended to use normal GAS, so that everything can run smoothly and your assets can reach the destination wallet faster with the best estimated delivery time.