Self-care and self-soothing are different!
Chronic stress, lack of sleep and exercise, or continually ruminating on debilitating thoughts can all cause trouble in body, mind, and spirit. Many people simply mischaracterize self-care as taking care of yourself AFTER you're already depleted; however, true self-care is a form of self-advocacy, and it suggests that as a general rule, the desire is to not allow yourself to become so depleted that your only recourse is to self-soothe. It should be something you prioritize rather than an "optional" activity.
Just as you cannot drive a car on empty, you cannot maintain productivity without taking opportunities to rest and recharge on a regular basis. Engaging in self-care consciously and intentionally will help the patterns "stick" and will also give you an idea of what works for you, and what doesn't, helping you tailor your approaches to better fit your needs.
Self-care also takes boundaries. In order to prioritize self-care, you may have to set and maintain new boundaries for yourself, which can feel risky, as you may be challenging the status quo, shaking up patterns in relationships, or may be feeling unsure about saying "No, thanks" or feeling as though you have to explain yourself to others. However, setting boundaries for yourself to engage in even small acts of self-care can be hugely impactful.
This might mean turning off your work phone at 5:00 PM rather than taking calls and messages throughout the evening. Or maybe it means asking your partner to look after the toddler for 20 minutes so that you can have some time for a bubble bath, and then reciprocating. It may mean saying "No, thanks" to a social work-related outing so that you can make the yoga class you love, rather than spending the evening impressing the new boss. Whatever this may look like for you, begin to take steps towards new patterns of self-care. Your future self will thank you!