If you want to secure a specific username without risking a permanent ban or a malware infection, you must rely on legitimate, manual methods.
Discord occasionally purges inactive accounts (rare). Pick an unpopular time (4 AM EST), open your browser’s developer tools (F12), and use the Network tab to watch for 200 OK responses when you manually try to change your name. No code. No bans.
If you are lucky enough to own a rare or clean username, The moment you release the handle, sniper bots monitoring the API will claim it within a fraction of a second. You will lose it permanently. Secure Your Account Credentials