I would love to hear some of your ideas so I can try them too! Personally, journaling, drawing, or crocheting is a good way to practice self-care, especially if I'm in a mood or funk I need to get out of.
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Its an everyday thing but showering, I love the warm water and just thinking. It just washes away the day and I can think happily instead of worrying about anything.
Try out new stuff/techniques or combine old stuff/techniques.
Atm I'm figuring out macramé (never tried before), and how to combine it with soapstone-carving (very well known, never mastered)
Journaling! It helps to get out all the stored feelings and reflect on my life. What is going ok, what I'm doing wrong, what I need to change and what I need to do to elevate myself.