One of the problems with macro mode on many digital cameras is the flash washes out details. The best way to control this is, of course, to avoid using the flash or us an accessory light like the one Whiteoakart linked to in the brilliant instructable https://www.instructables.com/id/EREFVJIHC1EQHO9ZEU/.
However if you do need flash, and your cheap POS camera has poor flash metering here's what to do.
First you'll need
1(one) Cheap Digital Camera
1(one) sheet mailing labels
1(one) pair scissors