Some people find a Fit-bit or similar electronic device useful for increasing activity, monitoring diet, sleep, and so on. You didn't say which areas of care you are hoping to work on. Another strategy is a watch or cell phone that gives you alerts for such things as standing to stretch while on a long shift of sedentary activity, reminds you to take that walk at lunchtime, and reminds you it's time to start your bedtime routine.
Also learn to praise yourself for small accomplishments. "Teeth are brushed - good job." Although it would seem infantilizing, many of us need to think of ourselves as lab rats capable of being trained. LOL - but true.
If you give more details of the kind of care you need, we can be more helpful, I think.
I also liked the suggestion of involving a family member, but that depends on the person.