You can use the uniswap aArbWETH <> ETH pool to swap your deposit tokens for the underlying at market price (i.e. a discount). If you are unable to do so due to debt drawn against the collateral, you should be able to use the aArbWETH <> aArbwstETH pool to swap the collateral tokens directly. Just make sure to enable collateral for wstETH on Aave!
As with any DEX swap, make sure to carefully check slippage limits and liquidity conditions to make sure you are receiving a price you deem fair for your input tokens. Please note some ill-willed users deployed Uniswap V4 pools with exploitative fee structures – make sure you’re using a V3 pool that gives you a fair output.