I'm sorry to hear about your situation. If you have lost access to your wallet because you forgot to back up your seed phrase, it may be challenging to recover your funds. Without the seed phrase, it is usually not possible to change or retrieve the wallet address.
However, you can try reaching out to the support team of the wallet service you were using to see if they can offer any assistance or guidance. Sometimes, they may have alternative methods to help you regain access to your wallet.
In the future, it is crucial to always securely back up your seed phrase and store it in a safe place. This is your key to accessing and recovering your funds, so it's essential to keep it safe and private.