How to crack a half known password for a specific username in termux?

[Marnie]

What is the process for cracking my password for a specific username? I recently lost my password for my  account. Its a self generated 16 character password which i remember half of it? Do i need to add a link to the website in hashcat? In other words,  How do i set up hashcat brute force attack to only crack a password for a specific username? Can i please have an example?