According to the Ethereum staking rules, staked Ether and rewards are frozen in the network until the launch of phase 2 of Ethereum 2.0 (approx. in 2 years) thus currently it is impossible to withdraw ETH.
However, to provide our users with a more flexible option we will issue ERC-20 GETH tokens, Guarded Ether, which you will receive in a 1:1 ratio to ETH. You will be able to sell this token using DeFi exchanges like Uniswap while your Ether is locked.