If your password is so hard to type that you’re starting to wonder about creating another user such that it’s easier for you to get into your own machine, maybe you shouldn’t be so crazy about password length.
There are many things to say about password security (and security in general) but my point of view is : beyond 15~20 chars, adding more chars give you an illusory sense of security. “Real” security improvements may be improved by : studying and reducing the attack surface, having 2FA and/or using asymetric keys, not installing apps that you don’t need or that are known to have security issues, implementing fail2ban for all possible authentication interfaces, keeping your server up to date, etc. Switching from a 15-char password to 128-char password is just bullshit (apart from using a pass phrase for the sake of keeping it easy to remember). Nobody gets into a server just by brute-forcing a 15+ char password.
Great, but if you really care that much about security, consider that it’s not the only way an attacker can ‘attack’ this user. Vulnerabilities may exist in various apps (or other things, for example SMTP, XMPP, …) that may allow to enter your server via this user.