Touch paper once if you can. Deal with things the week they arrive. Don’t let things pile up. But if you do, bite the bullet and set aside time that month to get back on top of things.
File things properly. Do it fast. Then it’s easy to find later. And it’s off the floor, desk, counter, table, etc.
Have a good filing system. Have any to start. Then improve it.
Get on top of your admin. You can thank me later.