When thinking about self-care, an important question to start off with is:
Am I meeting my basic self-care needs?
Self-care is often the basic stuff.
For example, sleep, nourishment, personal connection with others, time out to enjoy the things you love. ~ that sort of thing.
If the answer is no.
Congratulations, this is normal.
I can be difficult to meet all our basic needs all the time.
For example, the self-care things that slip off my radar when I'm working are sleep and getting outdoors! I know when I’m not taking care these when I feel agitated, begin rambling, and have the concentration span of a pea.
So at this point, it's good to look forward (rather than backward) and make a plan to begin meeting some of those self-care needs bit-by-bit over time.
Not all at once.
Starting off by choosing one small thing. Or even part of 1 small thing.
For example, sleep, pick 2-3 nights and try to go to bed 30 minutes earlier.
Take 1 self-care thing, make a realistic and achievable plan for incorporating it into your day.
And then move onto the next thing when ready.
Hope this helps.
If needing self-care ideas, check-out 70 Acts of Self Care