i look at what sign the full moon is in and use that significance to reflect on certain areas of my life. for me the ritual usually includes meditating, journaling, and tarot. i like to really commit to the witchy ambience with some candles or incense, crystals, relaxing music, nice pajamas, etc. makes it more fun!
you can really make it your own by including stuff like a bath, long skincare routine, watching your fav movie, yoga, etc.
you also don’t necessarily have to « believe » in astrology or moon cycles to get into this, the full moon is kind of just a prompt for a night of self-care and reflection!