I'll be honest there is not a specific way I end my acnh day! sometimes my switch just dies i'll normally pick a stopping point when my husband comes home from work/we start dinner :')
Most nights I finish off by doing one last run around the island in search of sharks and fun bugs, then head back to my house. As a way of signalling to myself that I’m done for the day, I actually turn off all the lights in the house and put myself to sleep in the bedroom. It’s kind of a cute way to wrap up
When I was younger I'd do the whole pjs get in bed turn of lights.
Now I usually end the day by organizing and emptying my pockets.
Days I don't I really notice the next day and it drives me nuts so I always "reset" my pockets.
Meaning, slingshot, net, fish rod, bug net, shovel , axe, customization paint, maybe a wand
And nothing else in the bottom row.
I end mine by organizing my pockets like the neat freak I am everything's gotta look a certain way for me. One side for tools, one side for things I plan to sell, one side for all mats, and another side for my dug up trees
Usually the last thing I do is order special items from Nook shopping. I save those for last in case I get the spend 5000 bells NM+ goal after the shops close.
Buy new clothing from Able's before it closes, then check out clothing options at Harv's island or redesign part of my island until I'm feeling stuck/indecisive
If I do physically put it down for the day, which is seldom, I usually make sure pockets are all cleaned up and everything's sold or put away in storage, and then that's it. If it's at like 4 a.m. that I do this, I will just go ahead and change into the next day's outfit to save time when I wake up and play again.
Most of the time though? It's whenever I fall asleep playing it in bed LOL