The high fees of gwei in Ethereum transactions are due to the supply and demand dynamics of the network. When the network is congested, users need to pay higher fees to prioritize their transactions. The popularity of DeFi and NFTs has increased demand for Ethereum transactions, leading to higher fees.
you can always alternatives for the purchase of what you are trying to do, if for example you are building an app on top ethereum, you can go for other chains with lower gas fees, I had the same issues with etherem, i have to migrate to stellar because they have lower gas fee.