Since you can't use your old phone anymore and you're currently using WhatsApp on your computer, I understand your concern about losing your chat history.

 

When you link a device to your WhatsApp account, your most recent message history is synced to the new device. However, not all messages and chats are synced to linked devices from your phone. 

 

If you install WhatsApp on your new phone, your chat history on the computer might not be affected immediately. But, if you register your new phone with the same phone number, it's possible that your chat history on the computer might be overwritten or lost.

 

To avoid losing your chat history on the computer, I recommend that you don't register your new phone with the same phone number just yet. Instead, you can try to back up your chat history on the computer or take screenshots of your important conversations.

 

If you need more help or have any further questions, feel free to ask.

 

 

Learn more in these articles:

 

https://faq.whatsapp.com/1144861179456352?cms_platform=windows-desktop

 

https://faq.whatsapp.com/1039228717453239?cms_platform=windows-desktop

 

https://faq.whatsapp.com/653480766448040?cms_platform=windows-desktop