Consistency is tough to maintain. It’s also something that seems to be highly valued. If you can be consistent it translates to being reliable, being something that others can count on.
There are various internal and external influences in play that effect our ability to be consistent.
Sometimes it’s really tough. Sometimes it gets boring, being consistent. Sometimes it’s good to be consistent (like always being on time); sometimes it’s better to mix it up (consistently eating the same things might limit your taste to new foods).
Decide what you want to be consistent about, then stay after it. Don’t give up. If you falter in your effort, no worries. If it matters to you, get back on track, and keep after it.