If you forgot your iCloud backup password, you may be able to recover your account. This depends on if you have access to your Uniswap Wallet app and your recovery phrase.
If you do not have the app installed, but you do have a manual backup in place, then you can download the app.
Follow these instructions: How to import my recovery phrase.
If you still have the Uniswap Wallet app downloaded, you can delete the wallet iCloud backup password and create a new one.
Follow these instructions: How to create a new iCloud backup password.
If you do not have the app installed and you do not have a manual backup in place, then there is nothing that can be done to regain access to your self-custodial wallet.
Learn more: I forgot my recovery phrase. What can I do?