I have selected some products that I want to use up, and have put them in a dish so they are right in front of me when I do my makeup.
It reminds me to use them more - not that it works 100%...
I have also rearranged my lipsticks (by colour, rather by brand) in the hope that I will use some older/forgotten products more than I have in the past.
There are products that I bin just because I don’t use them, for example some cream eyeshadows. I know I don’t like them because of colour, texture or quality, so why keep using them if they just annoy me? I have had them long enough and they are probably past their best anyway.
I’m not great at using up products because I get easily bored with products that I don’t love, but on a positive note, it is teaching me what I really love and use, and what I don’t.