If you are afraid of the cost of ethereum gas, it is better if you store ethereum on an exchange so that you are not exposed to gas fees, it is better because ethereum gas is still unstable and it is true that gas costs always fluctuate every time this really causes problems for the current ethereum blockchain users.
Now there is a good opportunity to earn money on various decentralized platforms for farming Finance. All these platforms also work with the use of smart contracts. And all this requires payment of the network commission to connect and work.