Unstaking on Trezor 3

I'm having some issues unstaking ETH on my trezor. I'm just trying to practice these transactions so I am familiar with them in the future. For example I have 0.20 eth staked and i wish to unstake. But the default normal gas limit is 432,000 and gas price 88.5 gwei and says i dont have enough eth for this transaction. I still have about .0048 eth unstaked to pay any kind of fees, but i didnt think it would be this high of a fee to unstake. Unless I'm missing something. If the unstake rewards and far lower than the fee it takes to unstake, whats the point of staking to begin with? Can anyone help?