I haven’t missed or been late for an appointment in probably a decade.
Literally just put it in your calendar and add a notification for enough time ahead of it.
I also snooze emails instead of letting my inbox clutter. I have an empty email inbox. Those concert tickets will pop into my inbox right around the day of.
I pre-send texts with a timer. Like if I know I’m driving 5 hrs to see my folks, I’ll pre-send a text for that day that says “on my way, should be there around _____”
That way all I need to do is update them if something goes wrong.
Idk, cell phones make being present, available, and on time, really fucking easy. Like I have severe ADHD, if I am always on time and you’re not, you’re fucking up somewhere. Use the tools in your pocket. It’s easy.