Ritual

"something done regularly"

"a repeated action done regularly, almost without thinking — not religious necessarily, but personal and habitual, something that marks routine and belonging."

"something you do the same way, at the same time, not because you have to but because it holds meaning for you — like the morning cup of tea that is really about peace, not caffeine. You might say: His evening walk had become a ritual — fifteen minutes by the river where the day could not follow him."