I see that notifications and favorites have already been suggested, but there's another thing - once a package arrives at the pickup point, it's usually stored for a limited time. If you don't pick it up in time, the system sends an SMS with a final warning, and then it actually returns the item. It becomes a vicious cycle: a notification comes through, you skim it among hundreds of other things going on, and then you forget because you didn't anchor it to anything in your memory.
Something that might help: as soon as your order is ready for pickup, immediately write yourself a reminder in your phone's calendar or an app like Todoist for a day or two ahead, and while you're at it, note down the pickup point number or at least the product code. A single system notification isn't enough because you can scroll past it in your notifications list and forget about it. But a calendar event will pop up at just the right moment.
And one more important thing: if you're ordering on impulse, it makes sense to ask yourself honestly right away - do you actually need this thing or is it just a click? Because you've already noticed a pattern, and it speaks for itself. Maybe some of these orders shouldn't have been placed at all.