First, it's equally important to use different usernames.
Second, you are doing better than most based on what you already said but there's always room for improvement.
See this article for greater insight:
‘Password’ and ‘123456’ Once Again Top Most Popular Password List for 2015 (So Please Change Yours)
Choosing a new password is as easy as “123456,” at least for some.
Password management company SplashData released its annual list of commonly used passwords and the company’s findings reveal that computer users not only continue to ignore exhortations from security experts but also ignore the significant publicity that the annual list generates.
The two top passwords on the list are the same as last year’s, namely “123456” and (with apologies to Allen Ludden) “password.” The 2015 list reveals, among other things, that football may have overtaken baseball in popularity and that millions of users believe that substituting the number “0” for the letter “o” to create “passw0rd” would somehow be secure, although that may be a result of some password validation routines insisting that the password include at least one numeric character....
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Above appeared in FBT, where I serve as EdDir.